Weakly interacting atomic gases at ultra-low temperatures are superfluid. Owing to the high degree of control they offer, these quantum gases give access to a wonderful playground to explore superfluid dynamics. In particular, quantum gases flowing inside waveguides can mimic the behavior of electrons in superconducting circuits, opening the new field of 'atomtronics.' The elementary circuit is the ring, where the atomic circulation is expected to be quantized. I will discuss two opposite limits: the production of a small current of a few quanta, and the fast rotation regime where the velocity exceeds the speed of sound.

Cold atoms offer a wonderful platform for quantum technologies for novel sensing, timing and of course quantum computation. I will describe how atoms and ions are cooled and state prepared for such applications, drawing on the UK National Quantum Technology Programme. Prospects for applications will be explored for time standards and sensors. In the longer term, laser cooled atoms and ions offer great potential for information processing. Universal quantum computers will be able to act as simulators of any system. But a simpler quantum device, able to mimic a real system, does not have to be a quantum computer. Such devices are quantum simulators; they are not universal but are simpler to construct. We expect early quantum simulators to be developed relatively soon, allowing certain regimes of problems, intractable for classical computers, to be solved. Cold atoms make good simulators: they provide naturally identical qubits without the need for high-quality materials fabrication. Quantum simulators with networked laser cooled trapped ions or cold atoms in optical lattices are already able to provide information about problems inaccessible to classical computers. Scaling of quantum processors to hundreds of qubits or more is a major engineering challenge, but arrays of ion or atom-based qubits offer great potential that is being rapidly explored around the world.

Join us in this panel discussion to explore the challenges and opportunities of converting global innovation initiatives into a thriving sector: are we in a super position to realise the full potential of quantum technology for all?

We have used a pyramid magneto-optical trap (MOT) to create a compact source of cold rubidium atoms. The four dielectric-coated metal mirrors in vacuum are arranged in the form of a pyramid that creates the light field for a MOT from a single ingoing laser beam. The atoms are pushed out through a hole (aperture) in the apex of the pyramid, in a direction determined by the laser light, to give a flux of Rb-87 atoms greater than 2 × 10^10 per second with a mean velocity of 33 m/s (FWHM of 28 m/s) and a divergence of 58 mrad. The pyramid MOT has a unique mechanism for adjusting aperture size and it is highly suitable for portable quantum technology devices.

Quantum technology devices are approaching a level of maturity, which would allow for adoption by non-specialist users. The advancements made in microprocessor-based electronics and database software can be combined to create a flexible, efficient, and modular experimental monitoring system. We present an example of such a monitoring system where key experimental parameters such as vacuum pressure, laser beam powers and electrical currents across a network of cold atom laboratories are monitored. The ability to passively collect data and cross-diagnose issues reduces debugging time and allows for efficient control over several cold atom experiments. This level of control facilitates the progression of atomic physics experiments. In my talk, I will show how using such a monitoring system has led to the production of a Bose-Einstein condensate (BEC) from home in one of our laboratories that did not have a BEC before.

Optical clocks enable frequency measurements with a systematicfractionaluncertainty of 10^-18 and lower. These clocks use opticaltransitions ofcold trapped ions in radio-frequency traps or cold ensembles oftrappedneutral atoms as frequency references with long-term stability.There isan increasing demand for commercially available precise clocksfor bigdata, stock exchange, and positioning systems. Further,ultra-precise clockscan be used to test General Relativity, search for new physics,and geodeticmeasurements. Todate, precise clocks are realized mainly inlaboratoryexperiments and require highly trained operators. We aredeveloping chip-basedion traps for portable optical clocks that can be used for field measurements,as well as multi-ion clocks that enable faster precisionmeasurements.In this talk, we will give an update on ion trap technologiesthat willhelp to make the clocks smaller. This includes more compactelectricalconnections and space-saving

This presentation: "A centilitre-scale vacuum chamber for compact ultracold quantum technologies", for the Cold Atoms for Quantum Technologies conference of the SPIE Photonex and Vacuum Expo 2020

Presentation: "Quantum memories using Rubidium and what this means for photonic quantum computing", for the Cold Atoms and Ions for Quantum Technologies conference of the SPIE Photonex and Vacuum Expo 2020.

Quantum sensing devices are typically comprised of many large pieces of laboratory equipment which in their current state have a limited number of industrial applications. However, utilising the benefits afforded by additive manufacturing (AM), an order-of-magnitude reduction in size, weight and power requirement was deemed plausible. The OPTAMOT project carried out by Added Scientific Ltd. in conjunction with the Physics departments at University of Nottingham and University of Sussex, has focussed on re-designing magneto-optical trap (MOT) assemblies for manufacture by laser-powder bed fusion. The resulting MOT performance characteristics and achieved reductions in size, weight and power will be presented.

Inertial sensing based on cold atom technologies has been proposed as a possible answer to the limited accuracy of current inertial navigation systems. Cold atom technologies offer measurements of inertial quantities that have unprecedented precision and accuracy. However, sensor accuracy is only one of the factors that limit the performance of purely inertial navigation systems. This paper reviews the possible benefits that cold atom quantum sensing may offer in navigation, and discusses a specific example where cold atom gravity gradiometers can be used to augment a standard inertial navigation system through gravitational map-matching.

We present a mobile 3D accelerometer based on matter-wave interferometry, which is capable of measuring three orthogonal accelerations, each with respect to an independent inertial reference frame defined by the surface of a mirror. On each axis, we construct a hybrid quantum/classical accelerometer by using correlations between the atoms and a mechanical accelerometer attached to the back of each reference mirror. This system combines the large bandwidth and dynamic range of classical devices with the high sensitivity and accuracy of atom interferometers. By correcting each classical accelerometer independently, we are able to track the full acceleration vector with high accuracy.

The comparison between precision spectroscopy measurements with cold trapped HD+ ions and accurate predictions of the molecular ion theory is exploited to characterize a THz electric field. A THz-wave off-resonantly coupled to the rotational transition at 1.3 THz may be detected by measuring the lightshift induced on a Zeeman component of the two-photon rovibrational transition at 55.9 THz. A set of six lightshift measurements for two different orientations of the magnetic field in the ion trap can be converted into the amplitudes and the phases of the THz electric field components in a Cartesian laboratory reference frame.

We present a compact optical delivery design for a 2D+ MOT which is used in conjunction with a magnetic assembly and a commercial vacuum piece to create a standardised cold atom source. The design provides a plug-and-play system, free of optical alignment, capable of producing an atomic flux of >1e9 atoms per second with <50mW of laser power. The dimensions of the system are 67mm x 67mm x 112mm (W x H x L), where such compactness is achieved through a fixed optical design, additive manufacturing techniques, and a novel beam expansion method which forms a multiply split cylindrical beam.