View Session 
Opening Remarks
17 June 2024 • 9:10 AM - 9:20 AM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Michael E. Reimer, Univ. of Waterloo (Canada)
Opening remarks for Photonics for Quantum 2024.
Session 1:
Quantum Networks and Communication
17 June 2024 • 10:00 AM - 10:40 AM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Lindsay LeBlanc, Univ. of Alberta (Canada)
13106-14
17 June 2024 • 10:00 AM - 10:20 AM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
Neuromorphic (brain-inspired) photonics leverages photonic chips to accelerate neural networks, offering high-speed and energy efficient solutions for use in datacom, autonomous vehicles, or other time sensitive applications. However, the limited size of photonic neural networks limits the complexity of solvable tasks. A natural candidate to provide increased complexity is quantum computing and its exponential speedup capabilities. Specifically, we explore photonic continuous variable (CV) quantum computation. Combining classical networks with trainable CV quantum circuits yields hybrid networks that provide significant trainability and accuracy improvements. On a classification task, hybrid networks achieve the same accuracy as fully classical networks that are twice the size. When noise is applied to the network parameters, the hybrid and classical networks maximize accuracy below the expected on-chip noise level. These results demonstrate that hybrid networks can achieve increased performance with smaller network sizes, providing a promising route to scalable neuromorphic photonic processing.
13106-15
17 June 2024 • 10:20 AM - 10:40 AM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
With recent developments in the field of quantum computing and cryptography, establishing quantum networks would allow for the implementation of post-quantum cryptographic protocols, distributed quantum computing, and quantum sensor networks. Though, quantum networks require the use of quantum repeaters to preserve the transmitted quantum information over long distances. This work focuses on the implementations of quantum frequency conversion which is used to ensure the signal is of a suitable frequency for transmission between the different optical components in the system.
Break
Coffee Break 10:40 AM - 11:10 AM
Session 2:
Satellite Quantum Key Distribution
17 June 2024 • 11:10 AM - 12:20 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Raffi Budakian, Univ. of Waterloo (United States)
13106-16
QEYSSat: Canada’s first quantum communication satellite
(Invited Paper)
17 June 2024 • 11:10 AM - 11:40 AM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
The Quantum Internet will readily transfer quantum bits between users near and far and over multiple different channels, and could be used for secure communications, distributed quantum computing and metrological applications. Satellite to ground quantum links are a crucial technology, as they will allow large distances and reaching locations with little infrastructure. I will give an overview of the upcoming Canadian quantum communication satellite mission QEYSSat, and discuss recent advances in the generation and distribution of free-space quantum information using novel techniques including time-bin and reference frame independent protocols.
13106-17
17 June 2024 • 11:40 AM - 12:00 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
Satellite-to-ground continuous-variable quantum key distribution requires correction of the phase wavefront of quantum signals, where current state-of-the-art methods multiplex classical reference pulses (RPs) with the signal to measure the wavefront distortion, then apply a correction to the signal. As measurement of the RP wavefronts is a complex task, we developed a methodology requiring only RP intensity measurements to estimate the signal wavefront correction using machine learning. Our work shows that non-zero secure key rates are achieved using our machine learning algorithm, thereby delivering an alternate deployment paradigm for this global quantum-communication application.
13106-18
17 June 2024 • 12:00 PM - 12:20 PM EDT | Univ. of Waterloo, QNC Room 0101
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We present a satellite-compatible reconfigurable quantum network architecture. During the satellite-pass the network adopts a point-to-multipoint topology where all the users communicate with the satellite, whereas outside of a satellite pass, the signal is rerouted to form a fully-connected network between the ground users. Exploiting multiplexing techniques, we show simulation results that indicate that this scheme can be used to enhance the secure key rate and to connect a multitude of users on the ground with minimal hardware requirements.
Break
Lunch Break 12:20 PM - 1:50 PM
Session 3:
Entangled Photons
17 June 2024 • 1:50 PM - 3:20 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Stephen Hughes, Queen's Univ. (Canada)
13106-7
Periodically-poled silica fiber as a versatile quantum source
(Invited Paper)
17 June 2024 • 1:50 PM - 2:20 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
Quantum sources that produce entangled photon pairs are crucial and indispensable components in quantum applications. Entangled photon sources based on nonlinear crystals or waveguides require bulky free-space optics and precision alignment. In contrast, fiber-based entangled photon sources, where entangled photon pairs are directly generated in an optical fiber, make quantum technologies less costly, more practical and accessible, as well as compatible with telecom fiber network infrastructure. In this talk, we review the development of fiber-based entangled and hyper-entangled photon pair sources based on the periodically-poled silica fiber (PPSF). We demonstrate practical and high quality entanglement sources at room temperature, compact and alignment free. The technology has now been commercialized. My talk will reveal the key technological advantages of using PPSF as a nonlinear material for complex quantum state generation, including entangled, hyper-entangled, and hypo-entangled state generation. I will also briefly discuss the applications of polarization-frequency hyper-entanglement and characterization of high-dimensional entanglement systems, including deriving entanglement witnesses using machine learning.
13106-8
17 June 2024 • 2:20 PM - 2:40 PM EDT | Univ. of Waterloo, QNC Room 0101
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We present a new generation of efficient, highly tunable sources of entangled photons based on a unique liquid crystal phase called ferroelectric nematic phase. Our sources present a first-ever realization of photon pairs in soft matter with the ability of tunning the quantum state via engineering the molecular structure or even alter it dynamically with electric field. Presented concepts could lead to complex multi-pixel devices generating quantum light with real time tunability and therefore hold the potential to have a huge impact in the field of quantum technologies.
13106-9
17 June 2024 • 2:40 PM - 3:00 PM EDT | Univ. of Waterloo, QNC Room 0101
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Recent progress in the study of the non-classical macroscopic state of light such as the bright squeezed vacuum (BSV) sheds light on the characterization of spontaneous parametric down-conversion (SPDC) in the high-gain regime. However, the generation of high-dimensional entangled photon pairs with SPDC in this high-gain regime is still open to further exploration. Here, we present a comprehensive numerical study of the effect of the phase-matching function on the OAM entanglement in high-gain SPDC. We use a recently developed classical model of high-gain SPDC to compute the OAM spectrum of the entangled photon pair and examine how the OAM entanglement is affected by various important physical parameters of the SPDC setup. Our study not only gives fundamental insights into the scaling law in SPDC but also helps the application and experiments with bright sources of photons entangled in high-dimensional OAM spaces.
13106-10
17 June 2024 • 3:00 PM - 3:20 PM EDT | Univ. of Waterloo, QNC Room 0101
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In this talk, we establish chip-based integrated silicon nitride photonics as a platform for experiments on the interactions between free electrons and light. Placing the fibre-coupled microresonators in a transmission electron microscope, we observe a quantised loss of energy for electrons passing the waveguide in an aloof geometry and inelastically scattering off the initially empty cavity modes while generating photons. Coincidence measurements performed on both particles reveal the common origin of these correlated electron-photon pairs, while post-selection allows for enhanced imaging of the resonator’s optical modes and promises applications as a high-fidelity heralded photon Fock state source.
Break
Coffee Break 3:20 PM - 3:50 PM
Session 4:
Atoms and Photons
17 June 2024 • 3:50 PM - 4:50 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Crystal Senko, Univ. of Waterloo (Canada)
13106-11
Efficient broadband quantum memory using ultracold atoms
(Invited Paper)
17 June 2024 • 3:50 PM - 4:20 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
Neutral atomic gases provide fantastic opportunities for studying and controlling quantum phenomena, ranging from many-body physics to quantum computers. In our research, we use the well-known interactions between cold gases and electromagnetic radiation to harness various quantum degrees of freedom. Quantum memories, used for storing and manipulating photonic signals, will be a key component in quantum communications systems, especially in realizing critical quantum repeater infrastructure. Cold atoms have significant potential as high performance spin-wave quantum memories, due to the long storage times associated with low temperature and slow thermal diffusion. In our work, we demonstrate two memory protocols in ultracold (sometimes Bose-condensed) atoms, which hold the potential for high-performance light storage: the Autler-Townes splitting (ATS) and superradiant approaches. These methods provide a path towards practical implementations in both ground- and satellite-based quantum communications systems, and we are working on both increasing performance and developing practical implementations.
13106-12
17 June 2024 • 4:20 PM - 4:50 PM EDT | Univ. of Waterloo, QNC Room 0101
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The photonic approach is the only technology originally designed to achieve the massive scaling required for fault-tolerant universal quantum computation (over a million physical qubits). In my talk, I will describe the photonic approach, which combines topological error correction and measurement-based quantum computation in a modular and scalable manner. I will then explain how cavity-QED-based photon-atom gates with single atoms can dramatically simplify this effort, address its main bottleneck, and enhance its scaling to even larger numbers of physical qubits.
Break
Break 4:50 PM - 5:15 PM
Welcome Reception and Poster Viewing
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Conference attendees are invited to attend this Monday evening welcome reception and poster session. Come view the posters, enjoy light refreshments, ask questions, and network with colleagues in your field.
Poster Setup: Monday 10:00 AM – 5:00 PM
View poster presentation guidelines and set-up instructions at
https://spie.org/PFQ/Poster-Guidelines
Poster Setup: Monday 10:00 AM – 5:00 PM
View poster presentation guidelines and set-up instructions at
https://spie.org/PFQ/Poster-Guidelines
13106-46
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
Hybrid perovskite is one of the most prominent materials with detection property in the area of optoelectronics. According to its benefits, perovskite is favored by the scientists and has a various application in the third generation of light conversion facility due to its extraordinary optoelectronic properties, including tunable bandgap, large absorption coefficient with high charge carrier mobilities, solution-processable and low-fabrication cost. Unfortunately, perovskite faces challenges from crucial aspects, including stability against degradation, cost reduction and hysteresis problems. Consequently, it is necessary to incorporate some additives, which turns to the carbon nanotubes due to its high conductivity and stable chemical property. However, traditional conduction heat method will lead to the temperature gradient and be harmful to the nucleation of crystal. Therefore, a new reliable microwave-based method is introduced to synthesize the mixture of carbon nanotubes with hybrid perovskite to improve carrier migration.
13106-47
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
Research delves into the quantum realm's predictive prowess as our paper explores advanced techniques in quantum computation for metrological predictions. Emphasizing variational parameter estimation, we scrutinize the efficacy of quantum simulations and metrology in modeling complex physical systems and achieving high-precision measurements. Investigating parameter distributions and learning rates' impacts on predictive accuracy, we analyze the simulation errors, using the Schatten-infinite norm for precision evaluation. The methodology involves optimizing parameters through Cramer Rao Bound and Fischer Information, highlighting learning rates' influence on loss function regulation. Utilizing parameterized quantum circuits, our four-step information extraction procedure, starting with input preparation, promises to reshape predictive metrology by unlocking the potential of quantum computation.
13106-48
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
Data re-uploading trick was originally proposed for universal quantum com-
puting which achieves the universal approximation property. In this paper,
we introduce the data re-uploading to realize universal non-quantum photonic
computing with practical photonic integrated circuits (PIC). We aim to com-
prehensively discuss the various advantages and implementation considerations.
A notable advantage of this approach is the elimination of the need for
nonlinear photonic devices, which have been essential to enable photonic neural
networks in conventional configulations.
Another potential benefit is high robustness against PIC fabrication errors.
Further considerations for implementation includes fast modulators with
minimal loss over conventional thermal phase shifter
13106-49
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
An intriguing facet of cavity quantum electrodynamics is the occupation of virtual excitations in the ultrastrong
coupling (USC) regime, a phenomenon with significant implications. We explore mechanisms to convert virtual
particles, such as photons, into real ones through nonperturbative periodic oscillations. This approach, grounded
in Floquet engineering, offers novel insights and predictions, including a double-field-assisted splitting, real photon
production from the vacuum, and higher-order nonlinear quantum processes unique to USC. We will introduce a new
model to understand how to Floquet engineer the quantum Rabi model.
13106-50
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
The Reference-Frame Independent Quantum Communication for Satellite-Based Networks (ReFQ) project, launching on board the Canadian Quantum Encryption and Science Satellite (QEYSSat), aims to test the feasibility of space-to-ground Quantum Key Distribution (QKD) using a quantum source and novel QKD protocol. To prepare for launch, a testbench setup that simulates various phenomena ReFQ will experience on flight has been developed. This allows the module to be tested in satellite-like conditions in a full end-to-end demonstration, providing crucial insight for optimization, testing theoretical predictions, and ensuring readiness for flight.
13106-51
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
Inelastic electron-light scattering is a powerful tool for investigating optical properties on the nanoscale in an ultrafast transmission electron microscope. Combining electron microscopy with integrated photonics, the requirement of pulsed laser and electron sources can be overcome. In this talk, we demonstrate the spatial and spectral characterization of the intracavity field of a photonic chip-based, high-Q silicon nitride microresonator utilizing free electron-light interaction. By combining optical and electron spectroscopies, we moreover probe the emergence of various nonlinear intracavity states. This novel combination of nonlinear integrated photonics and electron microscopy promises new schemes in electron beam manipulation as well as electron-based probing of optical microresonator states.
13106-52
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
We present an overview of the upcoming Canadian Quantum Encryption and Science Satellite (QEYSSat) mission, focusing on payload and ground station development. QEYSSat's primary mission goal is to preform quantum key distribution (QKD) using polarization-based protocols such as BB84. To achieve this, QEYSSat is equipped with a photon detector module that will record polarization encoded photons sent from the ground. QEYSSat is expected to launch in the summer of 2025 and be fully operational within a few months of launch.
A quantum optical ground station (QOGS) is under development at the University of Waterloo to perform QKD experiments with QEYSSat once after it launches. An update on QOGS development will be presented.
Currently two sources are baselined for QOGS: a weak coherent pulse (WCP) source and an entangled photon source (EPS). Additionally, QEYSSat will have a WCP on board to send polarization encoded photons from space to ground. The downlink QKD will employ an asymmetric reference frame independent QKD protocol, where four output polarizations are measured in three different basis (H/V,D/A, R/L).
13106-53
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate entangled photon pairs is based on spontaneous parametric down-conversion (SPDC) in a non-linear crystal. However, a fundamental trade-off exists between entanglement fidelity and efficiency in SPDC sources due to multiphoton emission at high brightness, which limits the pair extraction efficiency to 0.1% when operating at near-unity fidelity. Quantum dots in photonic nanostructures can in principle overcome this trade-off; however, the quantum dots that have achieved an en- entanglement fidelity on par with an SPDC source (99%) have poor pair extraction efficiency of 0.01%. Here, we show a measured peak concurrence of 95.3% ± 0.5% and pair extraction efficiency of 0.65% from an InAsP quantum dot in an InP photonic nanowire waveguide. Additionally, we show that an oscillating two-photon Bell state generated by a semiconductor quantum dot can establish a secure key for peer-to-peer QKD while using all generated photon pairs. Using our time-resolved QKD scheme alleviates the need to remove the exciton fine structure splitting.
13106-65
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
The second quantum revolution, Quantum 2.0, is fueled by recent progress in generating and manipulating quantum states in both light and matter, leading to new applications such as quantum sensing, computing, and communications. These new applications, which leverage unique quantum properties, such as superposition, entanglement, and measurement sensitivity of quantum states to offer fundamental advantages over classical technologies, are in principle enabled by the Quantum 1.0 technologies such as lasers. As quantum information science and technology progresses steadily from a purely academic discipline towards technology demonstrations, the imperative to transition from laboratory-grade lasers to industry-grade lasers becomes evident in the quest for scalability, robustness, improved performance, and often, reduced SWaP (Size, Weight, and Power) for field deployability. This paper provides an overview of the current state and challenges of laser-enabled quantum applications, and outlines the advancements in laser technologies from bulk-optics to micro-optics to integrated photonics with their prospects towards the practical realization of quantum advantage.
13106-68
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
Heterogeneous computing (HC) systems are essential parts of modern-day computing architectures such as cloud, cluster, grid, and edge computing. Many algorithms exist within the classical environment for mapping computational tasks to the HC system’s nodes, but this problem is not well explored in the quantum area. In this work, the practicality, accuracy, and computation time of quantum mapping algorithms are compared against eleven classical mapping algorithms. The classical algorithms used for comparison include A-star (A*), Genetic Algorithm (GA), Simulated Annealing (SA), Genetic Simulated Annealing (GSA), Opportunistic Load Balancing (OLB), Minimum Completion Time (MCT), Minimum Execution Time (MET), Tabu, Min-min, Max-min, and Duplex. These algorithms are benchmarked using several different test cases to account for varying system parameters and task characteristics. This study reveals that a quantum mapping algorithm is feasible and can produce results similar to classical algorithms.
13106-25
17 June 2024 • 5:15 PM - 6:30 PM EDT | Univ. of Waterloo, QNC Atrium
Show Abstract +
Quantum entanglement is essential for building the backbone of quantum information systems. Our particular interest lies in long-range distribution of entangled photons in free space. To achieve this, we rely on photon pairs representing qubits with polarization correlation. The main focus of this paper is integrity of the quantum states in free-space links. When transmitted in atmosphere, classical signals suffer from wave front distortions caused by turbulence; however, its mechanism does not have the same bearing on qubit values. We study the effects of turbulence on quantum states by utilizing a laboratory testbed that includes an atmospheric chamber. It uses a system of controlled components capable of creating various turbulence conditions. When polarized signals are passed through the atmospheric chamber, we analyze the corresponding quantum states and evaluate the degree of entanglement using our mathematical models and existing metrics, such as the coincidence-to-accidental ratio.
Session 5:
Quantum Detectors
18 June 2024 • 9:40 AM - 10:40 AM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Sasan Vosoogh-Grayli, Univ. of Waterloo (Canada)
13106-1
Sensing and information processing by using superconducting nanowires
(Keynote Presentation)
18 June 2024 • 9:40 AM - 10:20 AM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
In this talk, I will present the latest results in superconducting single-photon detectors. Superconducting wires have remarkable sensitivity to single-photons and are a reliable and high-performance technology with significant impact on the quantum information research community. However, increasingly applications as diverse as detection of high-energy particles and searches for dark matter are being pursued. Finally, research on these nanowires has permitted their use for basic electronics circuits such as comparators, shift registers, and counters. We will review these and other topics surrounding the development of nanowire single-photon detectors.
13106-2
18 June 2024 • 10:20 AM - 10:40 AM EDT | Univ. of Waterloo, QNC Room 0101
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Here we show that incorporating broadband metamaterial perfect absorbers into a photodetector’s active area can improve device efficiency and speed. We show an optical absorption of 93% across the spectral region where commercially available Si and InGaAs detectors have poor efficiencies. Combining the metamaterial perfect absorber with an avalanche photodiode layer stack, we aim to realize a high efficiency portable single photon avalanche diode with high timing resolution ideal for quantum ranging, quantum communication, and medical imaging applications.
Break
Coffee Break 10:40 AM - 11:10 AM
Session 6:
Quantum Sensing
18 June 2024 • 11:10 AM - 12:40 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Karl K. Berggren, Massachusetts Institute of Technology (United States)
13106-4
18 June 2024 • 11:10 AM - 11:40 AM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
Gyroscopes find wide applications in everyday life from navigation and inertial sensing to rotation sensors in hand-held devices and automobiles. Current devices, based on either atomic or solid-state systems, typically impose a choice between long-time stability and high sensitivity in a miniaturized system. Thanks to their optical properties, nuclear spins associated with NV centers in diamond have been proposed to overcome this challenge. While optical polarization improves these devices' sensitivities, further improvement is needed. Here, we propose a gyroscope protocol based on a two-spin system that includes a spin intrinsically tied to the host material, while the other spin is effectively in an inertial frame. The rotation rate is then extracted by measuring the relative rotation angle between the two spins starting from their population states, which are robust against spin dephasing. Importantly, the relative rotation rate between the two spins is enhanced by their hyperfine coupling by more than an order of magnitude, further boosting the achievable sensitivity. The ultimate sensitivity of the gyroscope is limited by the lifetime of the spin system and is compatible with a broad dynamic range, even in the presence of magnetic noises or control errors due to initialization and qubit manipulations. Our result enables precise measurement of slow rotations and exploration of fundamental physics.
13106-5
18 June 2024 • 11:40 AM - 12:10 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
The ability to manipulate and measure the degrees of freedom of light is central in modern photonic quantum technologies. Polarisation and path degrees of freedom are among the most used features of light. Still, a significant boost in information encoding can be achieved by exploiting spatial degrees of freedom, that is, using orthogonal sets of spatial modes that intrinsically offer access to infinite-dimensional Hilbert spaces within a single optical path. High dimensional entanglement between photon pairs naturally emerges from the phenomenon of Spontaneous Parametric Down Conversion, which delivers two-photon states with strong correlations in the spatial degree of freedom and, at the same time, anti-correlations in the transverse momentum. Correlations can also be observed in other degrees of freedom, such as Orbital Angular Momentum, Hermite-Gauss, and Laguerre-Gauss mode sets. Observing these correlations requires the use of tomographic techniques based on the ability to perform projective measurements in arbitrary mode bases. An alternative possibility is the use of interferometric techniques and coincidence imaging retrieved with time-stamping cameras to retrieve the full amplitude and phase structure of a biphoton state in a few shots. We reported the first example by showing how a second biphoton state is an ideal source to be used as a reference. This approach is much faster and more reliable than the projective one; however, it requires a reference source in phase with the unknown one. Coincidence imaging performed in different free space propagation planes of the biphoton state can be used to observe the propagation of the pump and phase matching function of SPDC, from which one can also extract phase information.
The spatial mode structure of SPDC can find applications in different areas of photonic quantum technologies. As a recent example, we show how the analysis of the Hermite-Gauss decomposition can be exploited to boost the estimation of small, incoherent lateral displacements.
13106-6
18 June 2024 • 12:10 PM - 12:40 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
Prior to the development of MRI, NMR diffraction (NMRd) was proposed as a method to investigate the structure of crystalline materials. When realized on the atomic scale, NMRd would be a powerful tool for studying materials structure, combining the spectroscopic capabilities of NMR with spatial encoding at condensed matter's fundamental length-scale. In this talk, I will present a nanoMRI platform for achieving angstrom-scale NMRd measurements.
Break
Lunch Break 12:40 PM - 2:10 PM
Session 7:
Trapped Ion Quantum Networks
18 June 2024 • 2:10 PM - 3:30 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Daniel B. Higginbottom, Simon Fraser Univ. (Canada)
13106-19
Connecting qubits: classical and quantum interfaces
(Invited Paper)
18 June 2024 • 2:10 PM - 2:40 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
An outstanding challenge in quantum networking is interfacing both classical and quantum technologies. A future quantum network will require one to effectively interface disparate qubit for entanglement distribution applications. In addition, the quantum network will also need to be seamlessly integrated with a classical network to realize the quantum protocols. This talk will highlight recent results toward interfacing integrated photonic qubits, trapped ions, and superconducting qubits and will present progress toward constructing a classical network infrastructure and initial results on operating the classical and quantum network in unison.
13106-21
Applications of photonics in trapped ion quantum computing
(Invited Paper)
18 June 2024 • 2:40 PM - 3:10 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
The quest to engineer quantum computers of a useful scope faces many challenges that will require continued investigation of the physics underlying the devices. In this talk, I focus on trapped ion quantum computing. I discuss several recent advances my research group has contributed regarding optical control of Ba+ ions for quantum information processing, including multi-level qudit control and novel all-optical loading techniques, and provide a brief outlook on how photonic technologies can enable further progress in this field.
13106-67
18 June 2024 • 3:10 PM - 3:30 PM EDT | Univ. of Waterloo, QNC Room 0101
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We present the growth control of InGaN single quantum dots (QDs) with photonic structures such as single InGaN QDs directly formed at the apexes of GaN pyramid array and single InGaN QDs embedded in GaN nanowires. We utilized several growth and post-growth methods including self-limited growth technique, nanoscale luminescence quenching, and polarization-controlled quasi-resonant excitation to enhance the single-photon purity by reducing unwanted background signals. Next, we demonstrated the quantum photonic device integration technique with a single InAs QD predetermined by using the nanoscale luminescence quenching method. Since the nanoscale luminescence quenching method can effectively reduce the luminous QD density while retaining the surrounding medium, a single QD emission can be extracted even from the high-density QDs.
Break
Coffee Break 3:30 PM - 4:00 PM
Session 8:
Quantum Key Distribution
18 June 2024 • 4:00 PM - 5:20 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Li Qian, Univ. of Toronto (Canada)
13106-22
18 June 2024 • 4:00 PM - 4:20 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
We study Polarization Mode Dispersion (PMD) in Quantum Key Distribution (QKD) using a broad-spectrum polarization-entangled photon source. We analyze polarization transformations over 10km deployed fiber channels, with measurements spanning one year of evolution. Finally, we propose strategies to mitigate the PMD effect for entangled-based QKD and elaborate an optimal filtering of the source.
13106-23
18 June 2024 • 4:20 PM - 4:40 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
The complexity of QKD devices is one of the barriers to the scalability of quantum networks. One of the factors is the preparation of random states, which involves quantum state measurement in the quantum random number generator and then the use of active light modulation to prepare QKD states. The alternative approach is passive state preparation. It was proposed in 2010 [1] and recently investigated for security aspects [2]. The idea is to use the natural phase randomness of the laser pulses to prepare random states. This approach can help to solve the security problem of correlating the state modulation voltage. Originally, the focus was on the preparation of the polarization state. In this work, we use a laser that generates random phase pairs of consecutive pulses as a ready-to-use qubit. This allows us to simplify the Alice device. To know the sent state we slit signal and perform tomography where we post-select four BB84 states. We experimentally demonstrate passive state QKD on 10 km deployed fiber.
[1] M Curty, et al. Physical Review A 82.5 (2010): 052325
[2] W Wang, et al. arxiv.org/abs/2207.05916
13106-24
18 June 2024 • 4:40 PM - 5:00 PM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
We demonstrate the feasibility of time-bin encoding in quantum key distribution (QKD) free-space optical (FSO) horizontal links. The QKD transmitter operates at a 0.6 GHz repetition rate, delivering time-bin qubits at 1558.98 nm over a turbulent channel between nearby buildings in Florence. The receiver incorporates a tip/tilt adaptive system to mitigate turbulence effects and improve stability. Our setup, utilizing a photonic integrated interferometer and superconducting nano-wire single photon detectors (SNSPD), achieves a high secret key rate (SKR) above 800K and stability for over 2 hours in different weather conditions.
13106-69
18 June 2024 • 5:00 PM - 5:20 PM EDT | Univ. of Waterloo, QNC Room 0101
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To study long-distance free-space quantum communication links, the Air Force Institute of Technology (AFIT) simulated, designed, built, and characterized an atmospheric turbulence simulator (ATS) with the Fried parameter ranging from 0≤ D⁄r_0 <18.2. The ATS was integrated with a non-turbulent path to conduct quantum interferometric experiments such as the heralded single photon g^2 (τ), and the two-photon Hong-Ou-Mandel (HOM) measurement. We observed that g^2 (0) increased to 1 and that the visibility of the HOM dip significantly decreased in moderate turbulence . Additionally, we tested the reconstruction of polarized-entangled photonic states in various turbulence regimes, and as expected, turbulence weakly affected the reconstruction of the polarization states. This presentation details the experimental setup, results, and analysis of those experiments.
Session 9:
Quantum Dot Entangled Photon Sources
19 June 2024 • 9:20 AM - 10:50 AM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Tim Schröder, Humboldt-Univ. zu Berlin (Germany)
13106-26
Quantum dot coherent control for quantum communication
(Keynote Presentation)
19 June 2024 • 9:20 AM - 10:00 AM EDT | Univ. of Waterloo, QNC Room 0101
Show Abstract +
Temporal encodings of quantum information are prevalent in applications because of their suitability for long-distance quantum communication and their compatibility with optical fiber communication networks. Perhaps the simplest temporal encoding is time-bin encoding, i. e. in superpositions of two (or more) temporally separated optical pulses.
Early attempts at generating time-bin entanglement from single quantum emitters was not able to avoid the problem of re-excitation or was converted probabilistically from polarization entangled photon pairs from a quantum dot. Direct generation requires a metastable level to carry the coherence and avoid double pair emission into the desired time bins.
In order to use dark exciton states as metastable states we have worked on their efficient creation and coherent control in the presence of in-plane magnetic fields. Much of this is based on our recent work on advanced excitation schemes using chirped pulses. With chirped pulses we are now able to deterministically populate a dark exciton state and to transfer this population to the biexciton, which can then emit a photon pair.
13106-27
19 June 2024 • 10:00 AM - 10:20 AM EDT | Univ. of Waterloo, QNC Room 0101
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Highly entangled photon sources play a crucial role in advancing the capabilities of quantum networks. In this context, we introduce an advanced scheme aimed at improving entanglement of photons emitted from quantum dots based on the framework proposed by Fognini et al. (2018). We propose a setup with reduced physical footprint which employs one electro-optic modulator strategically to enhance entanglement, mitigating the detrimental effects of fine structure splitting (FSS) observed in quantum dots that contribute to the degradation of entanglement.
13106-28
Dynamical resonance florescence in cavity and waveguide QED
(Invited Paper)
19 June 2024 • 10:20 AM - 10:50 AM EDT | Univ. of Waterloo, QNC Room 0101
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We discuss the exciting regime of "dynamical resonance florescence," which adds significant modification and fundamental control to the usual CW resonance florescence schemes such as the Mollow triplet, when using coherent pulses whose time duration is shorter than the inverse decay time of the emitter (quantum dot or two level system). We present two examples, including (i) semiconductor quantum dot cavity systems, where we also show recent experiments and simulations side by side,
and (ii) waveguide QED systems excited with single photon Fock states. We describe how the usual emission spectrum and intensity outputs are dynamically modified with short pulse excitation, and also demonstrate how single photon nonlinearies are uniquely accessed in this regime. These short-pulsed emission regimes
with dynamic driving of two-level emitters allow for the generation of a variety of exotic quantum states of light.
Break
Coffee Break 10:50 AM - 11:20 AM
Session 10:
Quantum Dot Single-Photon Sources
19 June 2024 • 11:20 AM - 12:30 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Ivan Iorsh, Queen's Univ. (Canada)
13106-29
19 June 2024 • 11:20 AM - 11:50 AM EDT | Univ. of Waterloo, QNC Room 0101
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Single photons and quantum interference between indistinguishable pairs of photons are promising resources in the ongoing development of quantum information technologies. On-demand generation of such photons on a photonic integrated circuit (PIC) is desirable as it can allow for stable operation and device scalability alongside other requisite components. Solid-state two-level emitters—in particular, epitaxial semiconductor quantum dots—have demonstrated to be a good source of single photons, though efficient integration onto PICs remains a challenge. Hybrid integration of such dots into on-chip photonic circuitry can provide a basis for testing practical implementations of quantum communication devices.
In this talk, I will discuss NRC's InP-based nanowire quantum dots and our work integrating these onto silicon nitride integrated photonics. The cryogenic environment poses challenges in the operation of key components such as optical phase shifters, tunable filters, and on-chip detectors. With this in mind, I will review our progress and near-term plans for realizing on-chip quantum information processing. Also examined is our recent work developing nanowire sources that emit in telecom O or C bands—a key requirement for practical long distance quantum communications—and coherent control schemes for optical pumping.
13106-30
19 June 2024 • 11:50 AM - 12:10 PM EDT | Univ. of Waterloo, QNC Room 0101
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The preparation of quantum-dot qubits in the excited state is an integral part of the performance of an on-demand single photon source. Recent excitation schemes strategically use pulses that avoid spectral overlap with the qubit emission for easier differentiation between the pump and signal. In this work, we look at the robustness of two such pumping schemes, (i) a dichromatic pulse, and (ii) a notch-filtered adiabatic rapid passage (NARP) approach, in the presence of phonon coupling. We find that due to large instantaneous pulse strengths, the dichromatic pulse suffers from phonon-induced pure dephasing and can have up to 50% worse performance as a single photon source. On the other hand, the NARP approach is more robust against the phonon coupling due to a weaker and smoother pulse profile.
13106-31
19 June 2024 • 12:10 PM - 12:30 PM EDT | Univ. of Waterloo, QNC Room 0101
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The development of photonic-based quantum information technologies depends on the availability of devices that consistently, and with high efficiency, deterministically emit identical single photons. Furthermore, a key requirement for the implementation of fiber-based quantum secured communication protocols demands that these sources be compatible with optical fiber networks operating in the low-loss telecom C-band (λ ~ 1550 nm). Semiconductor quantum dot emitters offer on-demand operation at high rates and can be incorporated into photonic structures that allow for high efficiency collection. Through composition engineering of InAs_(x)P_(1-x) dot-in-a-rod (DROD) nanowire quantum dot structures we have previously demonstrated single photon emission from wavelengths of up to the telecom O-band. Here we show how the DROD structure can be modified to shift emission wavelength to the telecom C-band with single-photon purities of g(2)(0) = 0.062. Through further optimization of these structures, we aim to dramatically increase source brightness with the long-term goal of developing scalable and efficient C-band emitting site-selected single-photon sources.
Break
Lunch Break 12:30 PM - 2:00 PM
Session 11:
Quantum Nonlinear Optics
19 June 2024 • 2:00 PM - 3:30 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Gregor Weihs, Univ. Innsbruck (Austria)
13106-32
Correlating photons using the collective nonlinear response of atoms weakly coupled to an optical mode
(Invited Paper)
19 June 2024 • 2:00 PM - 2:30 PM EDT | Univ. of Waterloo, QNC Room 0101
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Typical schemes for generating correlated states of light require a highly nonlinear medium that is strongly coupled to an optical mode. However, unavoidable dissipative processes, which cause photon loss and blur nonlinear quantum effects, often impede such methods. In this talk, I will report on our experimental implementation of the opposite approach. Using a strongly dissipative, weakly coupled medium, we generate and study strongly correlated states of light. Specifically, we study the transmission of resonant light through an ensemble of non-interacting atoms that weakly couple to a guided optical mode. Dissipation removes uncorrelated photons while preferentially transmitting highly correlated photons, created through collectively enhanced nonlinear interactions. As a result, the transmitted light constitutes a strongly correlated many-body state of light, revealed in the second-order correlation function. The latter exhibits strong antibunching or bunching, depending on the optical depth of the atomic ensemble. The demonstrated mechanism opens a new avenue for generating nonclassical states of light and for exploring correlations of photons in non-equilibrium systems using a mix of nonlinear and dissipative processes.
13106-33
19 June 2024 • 2:30 PM - 2:50 PM EDT | Univ. of Waterloo, QNC Room 0101
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The study of waveguide-QED systems, where a continuum of quantum field modes is coupled to qubits or two-level systems, has improved our ability to manipulate quantum light-matter interactions on chip. In the typical theoretical approaches to waveguide QED, there are a few necessary approximations, e.g., considering the system in the weak excitation regime, or treating the waveguide as a bath. However, these inherent approximations can break down with short pulse excitation. Here, we investigate the few-photon quantum nonlinear response of chiral qubits, when excited with one and two-photon Fock states. Our theory uses a numerically exact approach, based on Matrix Product States, avoiding the limitations of the usual waveguide-QED approximations.
Using a chiral-emitter waveguide system, we show explicitly the breakdown of the weak excitation approximation, and study the single and two-photon nonlinear responses. We demonstrate the impact on the qubit population, and discuss how the phase change can be examined from the photon quantum correlation functions, seeing a radical departure from scattering theory solutions.
13106-34
19 June 2024 • 2:50 PM - 3:10 PM EDT | Univ. of Waterloo, QNC Room 0101
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Semiconductor quantum dots (QDs) are a type of solid-state quantum emitter that can act as a near-ideal quantum light-matter interface when integrated with high-quality nanophotonic systems. Though QDs have typically been used to create state-of-the-art, on-demand single photon sources, here we widen the perspective on QDs, showing how to design quantum photonic integrated circuits based on both linear and nonlinear QD phase shifters. Specifically, we find that linear QD phase shifters can be used to realize cryogenically-compatible, fast, low-loss, and high-fidelity reconfigurable linear circuits. When paired with QDs that mediate interactions between photonic qubits, generating nonlinear phase shifts, deterministic quantum photonic logic gates can be achieved. Thus, our work paves the way for the realization of on-chip, cryogenically-compatible linear and nonlinear quantum photonic circuits, including quantum photonic neural networks, which can form the foundation for scalable and efficient quantum photonic technologies.
13106-35
19 June 2024 • 3:10 PM - 3:30 PM EDT | Univ. of Waterloo, QNC Room 0101
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We introduce a theory to model spontaneous emission rates and the Purcell factor for linear gain media, including coupled loss and gain cavity systems. We demonstrate why the usual Fermi's golden rule fails and show the impact of a non-local gain term. We show how to model such effects with a standard Maxwell calculation, which also exploits the power of quasinormal modes. As an application of the theory, we show how one can use gain compensation to improve the Purcell factors of gold-dimer plasmon modes by over one million fold.
Break
Coffee Break 3:30 PM - 4:00 PM
Session 12:
Diamond Devices and 2D Materials
19 June 2024 • 4:00 PM - 5:10 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Thomas D. Jennewein, Univ. of Waterloo (Canada)
13106-36
19 June 2024 • 4:00 PM - 4:30 PM EDT | Univ. of Waterloo, QNC Room 0101
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Optically active spin defects in diamond have proven to be a promising resource for the implementation of quantum information processing. Their long-term implementation requires the application of microwave and optical coherent control schemes to single, low noise defects coupled to diamond nanophotonic devices with near-unity interfacing efficiencies to the underlying photonic integrated circuits. Such systems will enable the generation of multi-qubit entangled states — the core resource for the implementation of long-distance quantum communication and quantum networking. In this presentation I will introduce our most recent efforts in applying photonic integrated quantum systems towards scalable quantum information processing.
13106-37
19 June 2024 • 4:30 PM - 4:50 PM EDT | Univ. of Waterloo, QNC Room 0101
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The NV centre in diamond has a long history in advancing quantum photonics technologies. Large-scale applications requires compatibility with integrated photonics for routing, with microelectronics integration equivalently important to realise control. Research to date has concentrated on microwires on diamond or in-house metallisation. In this work, we demonstrate integration of NV in nanodiamonds with silicon microelectronics. A key merit here is exploiting multi-layer metallisation for vector control and routing driving signals. We employ a 0.13um CMOS technology with seven metallic layers: the top layer for static magnetic fields with microwave control in the layer below, across 50μm spaced unit cells. Alignment markers enable lithographic positioning of nanodiamonds with associated NVs. We coherently control a positioned NV using the silicon structure and observe fifty times less power is required compared to an external antenna. The prototype paves the way for integrating solid-state quantum systems with sophisticated microelectronics, leveraging proximal silicon logic.
13106-38
19 June 2024 • 4:50 PM - 5:10 PM EDT | Univ. of Waterloo, QNC Room 0101
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Local mechanical deformation of atomically thin van der Waals materials provides a powerful approach to create site-controlled chip-compatible single-photon emitters (SPEs). At the same time, microscopic mechanisms underlying the formation of such strain-induced SPEs are still not fully clear, which hinders further efforts in their deterministic integration with nanophotonic structures for developing practical on-chip sources of quantum light. Here we investigate SPEs with single-photon purity up to 98% created in monolayer WSe2 via nanoindentation. Using photoluminescence imaging in combination with atomic force microscopy, we locate single-photon emitting sites on a deep sub-wavelength spatial scale and reconstruct the details of the surrounding local strain potential. The obtained results suggest that the origin of the observed single-photon emission is likely related to strain-induced spectral shift of dark excitonic states and their hybridization with localized states of individual defects.
Session 13:
Photonic Quantum Computing: Industry
20 June 2024 • 9:20 AM - 10:50 AM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Ebrahim Karimi, Univ. of Ottawa (Canada)
13106-39
To be determined
(Keynote Presentation)
20 June 2024 • 9:20 AM - 10:00 AM EDT | Univ. of Waterloo, QNC Room 0101
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To be determined
13106-40
Fault-tolerant integrated photonic quantum computing
(Invited Paper)
20 June 2024 • 10:00 AM - 10:30 AM EDT | Univ. of Waterloo, QNC Room 0101
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I will deliver an overview and progress of Xanadu’s photonic quantum computing architecture and the role that photonic chip integration plays in enabling its implementation.
13106-41
20 June 2024 • 10:30 AM - 10:50 AM EDT | Univ. of Waterloo, QNC Room 0101
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PsiQuantum is on a mission to build and deploy the world’s first useful quantum computer utilizing photonics integrated circuits (PICs). PsiQuantum’s integrated photonics platform is capable of on-chip generation, manipulation, and detection of photonic qubits. The focus of this talk will be on silicon nitride waveguide layer development in the PIC stack. Parameters such as thickness and critical dimensions of the waveguides and delta to design impact effective refractive index. Sidewall angles, coupler/resonator space and local fill affect coupling efficiencies and Q factors. Sidewall profile, line edge roughness (LER) and surface roughness have a considerable impact on propagation losses. The above-described dimensional parameters also impact the taper shapes that are utilized for edge couplers and efficient light transmission between multiple waveguide layers within an integrated stack. Fabrication approaches and strategies pursued to achieve high performance optical waveguides will be overviewed.
Break
Coffee Break 10:50 AM - 11:20 AM
Session 14:
Photonic Quantum Computing
20 June 2024 • 11:20 AM - 12:50 PM EDT | Univ. of Waterloo, QNC Room 0101
Session Chair:
Heike Riel, IBM Research - Zürich (Switzerland)
13106-42
Networking silicon qubits
(Invited Paper)
20 June 2024 • 11:20 AM - 11:50 AM EDT | Univ. of Waterloo, QNC Room 0101
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Distributed quantum processing over local optical networks is a route to fault-tolerant quantum computing at scale and practical quantum advantage. The performance of modular, networked quantum technologies will, however, be contingent upon the quality of their light-matter interconnects. Silicon colour centres offer optically-coupled spin qubit registers as the basis for quantum networks and distributed quantum computing. Silicon is an ideal platform for commercial quantum technologies: it unites advanced photonics and the microelectronics industry, as well as hosting long-lived spin qubits. The silicon T centre was recently discovered to combine direct telecommunications-band photonic emission, long-coherence electron and nuclear spins [1,2], and proven integration into industry-standard, CMOS-compatible, silicon-on-insulator (SOI) photonic chips at scale. In this talk I present recent advances networking T centres with nanophotonics. We enhance the optical emission rate by an order of magnitude with integrated nanocavities to create coherent optical interfaces. We determine the T centre’s hyperfine spin qubit coupling and introduce schemes for operating each T centre as a deterministic four-qubit spin register. T centre devices producing spin-entangled photons can make immediate use of integrated silicon photonic networks boasting low-loss active components, efficient coupling to standard telecommunications fibres, and efficient on-chip photon detectors. These elements may be assembled to create an on-chip spin-photon quantum processor that interfaces with optical fibres for long-range communication over the quantum internet.
13106-43
20 June 2024 • 11:50 AM - 12:10 PM EDT | Univ. of Waterloo, QNC Room 0101
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Recently, fluorescent point defects in silicon have been explored as promising candidates for single photon sources, which may pave the way towards the integration of quantum photonic devices with existing silicon-based electronic platforms. However, the current processes for creating such defects are complex, and commonly require one or two implantation steps. In this work, we have demonstrated implantation-free methods for obtaining G and W-centers in commercial silicon-on-insulator substrates using femtosecond laser annealing. We also demonstrate an enhancement of the color centers’ optical properties by coupling them with photonic structures. For example, we have shown an improvement in emission directivity for G centers by embedding them into silicon Mie resonators fabricated by dewetting, achieving an extraction efficiency exceeding 60% with standard numerical apertures. We will also address the control of emission polarization by embedding color centers in photonic crystals.
13106-45
20 June 2024 • 12:10 PM - 12:30 PM EDT | Univ. of Waterloo, QNC Room 0101
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Photonic graph states serve as promising resources in various measurement-based quantum computation and communication protocols, such as quantum repeaters. However, their realization with linear optics poses challenges due to the absence of deterministic photon-entangling gates in such platforms. A potential solution involves leveraging quantum emitters, such as quantum dots or NV centers, to establish entanglement and subsequently transfer it to the emitted photons. The design of a quantum circuit that implements the generation of a graph state within such a framework is highly non-trivial nonetheless. Here, we introduce a generation circuit optimization approach that leverages the concept of local equivalency of graphs and employs graph theoretical correlations to explore alternative, cost-effective circuits. Obtaining a 50% reduction in the use of 2-qubit gates for preparing repeater graph states highlights the potential efficacy of our method.
13106-70
20 June 2024 • 12:30 PM - 12:50 PM EDT | Univ. of Waterloo, QNC Room 0101
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We theoretically predict a quantum anomaly induced by borders and observe/emulate the predicted anomaly between two phases having topologically different boundary conditions for the Mott insulator on a finite-size photonic lattice.
Break
Lunch Break 12:50 PM - 2:20 PM
Lab Tours
20 June 2024 • 2:20 PM - 4:45 PM EDT | Univ. of Waterloo, QNC Room 0101
Photonics for Quantum attendees are invited to tour the labs at the University of Waterloo. Shuttles provided.
Quantum Photonic Devices Lab
The QPD lab at the Institute for Quantum Computing focuses on developing high-rate single-photon/entangled photon sources and novel quantum detectors for quantum networks, imaging and sensing, and photonic integrated circuits to manipulate light at the single photon level. Nanophotonics and Quantum Optics Lab - Prof. Michal Bajcsy The NPQO Lab focuses on employing exotic nanophotonics structures including metamaterials and plasmonics to achieve novel types of light-matter interactions in atomic and solid-state quantum emitters.
QuantumIon Lab
At the QuantumIon lab, the focus is to design and develop an open access quantum information processor which is tailored for various levels of user control. The quantum processor platform is based on a surface ion trap system using barium ions as a medium to store and process information. Techniques are also utilized such as entanglement of barium ions for complex quantum operations and individual addressing of ions for quantum information to be manipulated, extracted, and processed.
Quantum Photonics Lab
The QPL focuses on free space quantum communication. At IQC, QPL is developing a quantum optical ground station (QOGS) to communicate with the upcoming Canadian Quantum Encryption and Science Satellite (QEYSSat). QEYSSat and QOGS will be capable of performing quantum key distribution and other fundamental physics experiments between ground and space.
Quantum Simulation and Metrology Lab
The QSM lab aims at furthering our understanding of the properties of large, interacting quantum many-body systems and unlock new possibilities in the realms of quantum physics and technology, paving the way for groundbreaking advancements in the field. It is currently working on the development and experimental realization of advanced protocols for quantum computation, simulation, and metrology using programmable configurations of neutral atoms excited to a Rydberg state (Rydberg atom arrays).
Quantum-Nano Fabrication and Characterization Facility
University of Waterloo’s QNFCF is one of the most advanced academic research facilities in Canada with 6,750 square-foot cleanroom featuring ISO (International Organization for Standardization) 4, 5, and 6 certified process bays. The QNFCF offers dedicated space for device assembly and packaging, and is the house to state-of-the-art nano/microfabrication, materials processing, and materials characterization tools. The QNFCF offers access to tools ranging from deposition equipment supporting atomic layer deposition (ALD), plasma-enhanced chemical vapor deposition (PECVD), low-pressure chemical vapor deposition (LPCVD) and physical vapor deposition (PVD) technologies, etch equipment supporting reactive ion etching (RIE), ion milling, O2 plasma and wet processing technologies, lithography equipment including UV and electron-beam technologies, characterization equipment including surface profiling, thin film stress measurement, ellipsometry and microscopy, focus ion beam (FIB) and transmission electron microscopy (TEM), packaging equipment including dicing, cleaning (wet and H2 plasma), die bonding, wire bonding and encapsulation. Apart from catering to external academic, government, and industrial users, the QNFCF accommodates over 400 lab members working with more than 90 Principal Investigators from various parts of the campus and Canada.
Quantum Photonic Devices Lab
The QPD lab at the Institute for Quantum Computing focuses on developing high-rate single-photon/entangled photon sources and novel quantum detectors for quantum networks, imaging and sensing, and photonic integrated circuits to manipulate light at the single photon level. Nanophotonics and Quantum Optics Lab - Prof. Michal Bajcsy The NPQO Lab focuses on employing exotic nanophotonics structures including metamaterials and plasmonics to achieve novel types of light-matter interactions in atomic and solid-state quantum emitters.
QuantumIon Lab
At the QuantumIon lab, the focus is to design and develop an open access quantum information processor which is tailored for various levels of user control. The quantum processor platform is based on a surface ion trap system using barium ions as a medium to store and process information. Techniques are also utilized such as entanglement of barium ions for complex quantum operations and individual addressing of ions for quantum information to be manipulated, extracted, and processed.
Quantum Photonics Lab
The QPL focuses on free space quantum communication. At IQC, QPL is developing a quantum optical ground station (QOGS) to communicate with the upcoming Canadian Quantum Encryption and Science Satellite (QEYSSat). QEYSSat and QOGS will be capable of performing quantum key distribution and other fundamental physics experiments between ground and space.
Quantum Simulation and Metrology Lab
The QSM lab aims at furthering our understanding of the properties of large, interacting quantum many-body systems and unlock new possibilities in the realms of quantum physics and technology, paving the way for groundbreaking advancements in the field. It is currently working on the development and experimental realization of advanced protocols for quantum computation, simulation, and metrology using programmable configurations of neutral atoms excited to a Rydberg state (Rydberg atom arrays).
Quantum-Nano Fabrication and Characterization Facility
University of Waterloo’s QNFCF is one of the most advanced academic research facilities in Canada with 6,750 square-foot cleanroom featuring ISO (International Organization for Standardization) 4, 5, and 6 certified process bays. The QNFCF offers dedicated space for device assembly and packaging, and is the house to state-of-the-art nano/microfabrication, materials processing, and materials characterization tools. The QNFCF offers access to tools ranging from deposition equipment supporting atomic layer deposition (ALD), plasma-enhanced chemical vapor deposition (PECVD), low-pressure chemical vapor deposition (LPCVD) and physical vapor deposition (PVD) technologies, etch equipment supporting reactive ion etching (RIE), ion milling, O2 plasma and wet processing technologies, lithography equipment including UV and electron-beam technologies, characterization equipment including surface profiling, thin film stress measurement, ellipsometry and microscopy, focus ion beam (FIB) and transmission electron microscopy (TEM), packaging equipment including dicing, cleaning (wet and H2 plasma), die bonding, wire bonding and encapsulation. Apart from catering to external academic, government, and industrial users, the QNFCF accommodates over 400 lab members working with more than 90 Principal Investigators from various parts of the campus and Canada.
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