Information security concerns and explosive data transmission and storage have led to exciting new developments and advances in quantum cryptography, quantum communication, nonlinear optics, optical data storage, optical communication etc. We encourage you to submit abstracts and papers on the following and related topics: ;
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Conference 11905

Quantum and Nonlinear Optics VIII

In person: 11 - 12 October 2021
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  • Opening Ceremony and Plenary Session I
  • Plenary Session II
  • Poster Session
  • 1: Quantum Optics
  • 2: Nonlinear Photonics I
  • 3: Nonlinear Photonics II
  • 4: Quantum Technology With Atoms
  • 5: Sensing
Opening Ceremony and Plenary Session I
In person / Livestream: 10 October 2021 • 09:00 - 12:00 China Standard Time
9:00: Opening Ceremony
9:20: Awards and Recognition

11900-501
Author(s): Rebecca R. Richards-Kortum, Director, Rice 360 Institute for Global Health Technologies (United States), Rice Univ. (United States)
In person / Livestream: 10 October 2021 • 09:30 - 10:10 China Standard Time
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This talk will examine the challenges of designing and translating new low-cost optical technologies to improve global health equity, drawing from examples to improve newborn survival in African hospitals, to improve early detection of cervical cancer for women in Texas and Latin America, and to improve point-of-care diagnosis of COVID-19. The talk will summarize lessons learned to increase the diversity of innovation teams, and to increase the impact and sustainability of the resulting innovations.
11890-502
Author(s): Wentao Wang, State Key Lab. of High Field Laser Physics (China), CAS Ctr. for Excellence in Ultra-intense Laser Science (China), Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (China)
In person: 10 October 2021 • 10:40 - 11:20 China Standard Time
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X-ray free-electron lasers can generate intense and coherent radiation at wavelengths down to the sub-ångström region and have become indispensable tools for applications in structural biology and chemistry, among other disciplines. Several X-ray free-electron laser facilities are in operation; however, their requirement for large, high-cost, state-of-the-art radio-frequency accelerators has led to great interest in the development of compact and economical accelerators. Laser-wakefield accelerators can sustain accelerating gradients more than three orders of magnitude higher than those of radio-frequency accelerators, and are regarded as an attractive option for driving compact X-ray free-electron lasers. However, the realization of such devices remains a challenge owing to the relatively poor quality of electron beams that are based on a laser-wakefield accelerator. After ten years of efforts, we present an experimental demonstration of undulator radiation amplification in the exponential-gain regime by using electron beams based on a laser-wakefield accelerator.
11893-503
Author(s): Rui Zhu, Peking Univ. (China)
In person: 10 October 2021 • 11:20 - 12:00 China Standard Time
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Perovskite solar cells have attracted tremendous attention in recent years due to the high device performance and the superior optoelectronic properties of perovskite materials. In this talk, I will give an introduction about the advances of perovskite solar cells. Then, I will present our efforts on improving the device performance and understanding the device physics of perovskite solar cells. In addition, I will also discuss the advantages of perovskite solar cells for space aircraft application. We have some preliminary efforts of sending the perovskite solar cells into near space. I will share our view about the exciting possibilities for perovskite solar cell technology.
Plenary Session II
In person / Livestream: 10 October 2021 • 15:30 - 16:20 China Standard Time
15:30: Welcome and Introduction

Q&A period will follow after the talk
11905-504
Author(s): Peter L. Knight, Blackett Lab., Imperial College London (United Kingdom), UK National Quantum Technology Strategic Advisory Board for UKRI (United Kingdom)
In person / Livestream: 10 October 2021 • 15:35 - 16:05 China Standard Time
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The UK through a mix of government and industry funding has committed more than £1Bn over 10 years to a coordinated programme in quantum technology. Seven years into this programme I will describe here how we got there, and our goals for the future. The UK National Quantum Technology Programme has induced a step change in the UK’s capabilities for pushing forward a new sector in future information technologies. I describe how the programme arose and the activities it supported and influenced to deliver these new capabilities, building on a first phase almost £480M investment across several UK government agencies. The UK programme is now in its second phase, with a further substantial investment by UK government and global industries in the UK making a total of over £1Bn. I will describe our plans for ensuring the advanced quantum science and demonstrator platforms in imaging, sensing, communications and computing developed over the past seven years will drive the formation of the QT sector and embed quantum tech in a broad range of industries. References 1. “Blackett Review: The Quantum Age: technological opportunities.” Government Office for Science, Available: https://www.gov.uk/government/publications/quantum-technologies-blackett-review; https://uknqt.ukri.org/files/strategicintent2020/; Peter Knight and Ian Walmsley 2019 Quantum Sci. Technol. 4 040502
Poster Session
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Conference attendees are invited to attend the poster session on Monday afternoon. Come view the posters, ask questions, and network with colleagues in your field. Authors of poster papers will be present to answer questions concerning their papers. Attendees are required to wear their conference registration badges to the poster session.

Poster Setup: Monday 10:00 to 13:00
View poster presentation guidelines and set-up instructions at
https://spie.org/PA/poster-presentation-instructions
11905-24
Author(s): Sijia Wang, Kai Zhong, Kefei Liu, Tianjin Univ. (China); Jiawei Li, China Academy of Space Technology (China); Degang Xu, Jianquan Yao, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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The Fourier transform treatment on random quasi-phase matching (RQPM) problems in nonlinear polycrystalline materials is proposed to simplify the simulation process. The spatial frequency spectrum information of the polycrystalline material is obtained directly by Fourier transform analysis in the space domain, which is closely related to wave number and coherence length. Using this method to simulate the second harmonic generation (SHG), the results are consistent with the previous studies, which verifies the feasibility of this method.
11905-25
Author(s): Hongzhan Qiao, Kai Zhong, Fangjie Li, Xianzhong Zhang, Quan Sheng, Wei Shi, Degang Xu, Jianquan Yao, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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A high-conversion-efficiency, high-peak-power, widely tunable optical parametric generator (OPG) based on a multi-period periodically poled lithium niobate (PPLN) crystal is presented. Pumped by a passively Q-switched microchip Nd:YAG laser (pulse duration: 330 ps, repetition rate: 1 kHz), the OPG was continuously tunable from 1.49 to 4.5 μm by changing the grating period and working temperature. The maximum output power (signal and idler) reached 591 mW corresponding to the conversion efficiency of 67.1% and slope efficiency of 89.6%. The maximum peak power was over 1 MW for the signal wave at 1758 nm.
11905-26
Author(s): Xin Liu, Jiangsu Univ. of Science and Technology (China); Mengmeng Zang, Jiangsu University of science and technology (China); Ying Wang, Jun Dai, Jiangsu Univ. of Science and Technology (China); Wei Wang, Heriot-Watt University (United Kingdom)
On demand | Presented Live 11 October 2021
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In this paper, fundamental limitations of estimating the amplitudes and phases of polar-interferograms recorded at low light levels are investigated. By modeling the receiver as a spatial array of photon-counting detectors, results are obtained that permit specification of the minimum number of photo events required for estimation of fringe parameters to a given accuracy. Both a discrete Fourier-transform estimator and an optimum joint maximum-likelihood estimator are considered to specify the limiting performance of all unbiased estimators in terms of the collected light flux.
11905-27
Author(s): Hang Liu, Zhen-Qiang Yin, Rong Wang, Feng-Yu Lu, Shuang Wang, Wei Chen, Univ. of Science and Technology of China (China); Wei Huang, Bingjie Xu, Science and Technology on Communication Security Lab. (China); Guang-Can Guo, Zheng-Fu Han, Univ. of Science and Technology of China (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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The round-robin-differential-phase-shift (RRDPS) protocol was one of the unique quantum key distribution protocols. Owing to its removing monitoring signal disturbance, it can tolerate a high quantum-bit error rate, even a 50% bit-error rate in principle. In 2018, Yin et al. developed an interesting method to improve the security bound of RRDPS, and it still keeps the highest asymptotic secure key rate. However, the finite-sized analysis is missing. In order to analyze the finite-sized effects of Yin's work, we use a general method, post-selection technique, to predict the key rate in a finite-sized scenario. The results keep the advantage of introducing phase randomization and have reference value for its practical applications.
11905-28
Author(s): Jiaqi Geng, Guanjie Fanyuan, Shuang Wang, Key Lab. of Quantum Information, Univ. of Science and Technology of China (China); Qifa Zhang, Anhui Qasky Quantum Technology Co., Ltd. (China); Yingying Hu, Wei Chen, Zhen-Qiang Yin, Deyong He, Guang-Can Guo, Zhengfu Han, Key Lab. of Quantum Information, Univ. of Science and Technology of China (China)
On demand | Presented Live 11 October 2021
11905-29
Author(s): Yingying Hu, Xing Lin, Shuang Wang, Jiaqi Geng, Zhen-Qiang Yin, Wei Chen, Deyong He, Univ. of Science and Technology of China (China); Wei Huang, Science and Technology on Communication Security Lab., Institute of Southwestern Communication (China); Bingjie Xu, Science and Technology on Communication Security Lab. (China); Guang-Can Guo, Zhengfu Han, Univ. of Science and Technology of China (China)
On demand | Presented Live 11 October 2021
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We investigate a quantum random number generation (QRNG) based on backward spontaneous Raman scattering (SpRS) in standard single-mode fiber, where the randomness of photon wavelength superposition and arrival time are simultaneously utilized. The experiment uses four avalanche photodiodes working in gated Geiger mode to detect backward Raman scattering photons from four different wavelength channels and a time-to-digital converter placed behind the detectors to record their arrival time.
11905-30
Author(s): Sheng Ming, Shanghai Jiao Tong Univ. (China)
On demand | Presented Live 11 October 2021
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Lights carrying orbital angular momentum (OAM) have potential applications in precise rotation measurement, especially in remote sensing. Interferometers, especially nonlinear quantum interferometers, have also been proven to greatly improve the measurement accuracy in quantum metrology. By combining these two techniques, we theoretically propose a new atom-light hybrid Sagnac interferometer with OAM lights to advance the precision of the rotation measurement. A rotation sensitivity below standard quantum limit is achieved due to the enhancement of the quantum correlation of the interferometer even with 96% photon losses. This makes our protocol robustness to the photon loss. Furthermore, combining the slow light effect brings us at least four orders of magnitude of sensitivity better than the earth rotation rate. This new type interferometer has potential applications in high precision rotation sensing.
11905-31
Author(s): Zhendong Wang, Taishan Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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It is shown that, for the large area 4π pulse with smaller value of chirp coefficient C propagates in the mediums, pulse splitting occurs, but the splitting doesn’t occur for the 4π area pulse with bigger value of C ; and the oscillation of the spectral component near the central frequency becomes more severe and the pulse spectral bandwidth and the strength of the spectral component with higher frequency decrease obviously with the increasing of the C. For the pulse with larger area 8π, the case of pulse splitting is similar to that of 4π pulse, but the case of pulse spectral property is different from that of 4π pulse.
11905-32
Author(s): Xing Lin, Shuang Wang, Zhen-Qiang Yin, Guanjie Fanyuan, Rong Wang, Wei Chen, Deyong He, Zheng Zhou, Guang-Can Guo, Zheng-Fu Han, Univ. of Science and Technology of China (China)
On demand | Presented Live 11 October 2021
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Recently, a source-independent quantum random number generator (SI-QRNG), which can generate secure random numbers with untrusted sources, has been realized. However, the measurement loopholes of the trusted but imperfect devices used in SI-QRNGs have not yet been fully explored. Here, we point out and evaluate the security loopholes of practical imperfect measurement devices in SI-QRNGs. We also provide corresponding countermeasures to prevent these information leakages by recalculating the conditional minimum entropy and adding a monitor. Furthermore, by taking into account the finite-size effect, we show that the influence of the afterpulse can exceed that of the finite-size effect with the large number of sampled rounds. Our protocol is simple and effective, and it promotes the security of SI-QRNG in practice as well as the compatibility with high-speed measurement evices, thus paving the way for constructing ultrafast and security-certified commercial SI-QRNG systems.
11905-33
Author(s): Feng-Yu Lu, Xing Lin, Shuang Wang, Guanjie Fanyuan, Peng Ye, Rong Wang, Zhen-Qiang Yin, Deyong He, Wei Chen, Zheng-Fu Han, Univ. of Science and Technology of China (China)
On demand | Presented Live 11 October 2021
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The decoy-state method substantially improves the performance of quantum key distribution (QKD) and perfectly solves crucial issues caused by multiphoton pulses. In recent years, the decoy-state method has occupied a key position in practicality, and almost all the QKD systems have employed the decoy-state method. However, the imperfections of traditional intensity modulators limit the performance of the decoy-state method and bring side-channels. In this work, a special intensity modulator and its accompanying modulation method are designed and experimentally verified for the secure, stable and high-performance decoy-state QKDs. The experimental result indicates that its stable and adjustable intensities, convenient two-level modulation, inherently high speed, and compact structure is extremely fit the future trends and will help the decoy-state method to be perfectly applied to QKD systems.
11905-34
Author(s): Fangjie Li, Kai Zhong, Hongzhan Qiao, Xianzhong Zhang, Degang Xu, Jianquan Yao, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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A widely tunable eye-safe noncollinear phase-matched (PM) KTP optical parametric oscillator (OPO) with fixed output direction was proposed. Based on a novel confocal optics system, the input pump beam from a pulsed 1064 nm Nd:YAG laser could be deflected into the OPO with a tunable and agile noncollinear angle while maintaining the resonator unaffected. As a result, stable OPO operation with a wide tuning range of 124 nm was achieved easily with a beam scanner. The pump threshold, output energy, linewidth and temporal pulse shapes during wavelength tuning were also measured and discussed.
11905-35
Author(s): Fu Lifeng, Liu Jinlu, Zhang Chenlin, Zhang Tao, Shao Yun, Xu Bingjie, Institute of Southwestern Communication (China)
On demand | Presented Live 11 October 2021
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The phase compensation with high accuracy is one of the key technologies in continuous variable quantum key distribution (CVQKD) system, which directly influences the secure key rate and transmission distance. However, traditional phase compensation method cannot accurately estimate the phase drift due to the additive noise introduced by coherent detector. In this paper, we propose a new phase compensation method based on mean denoising, where a training sequence is designed for estimating phase drift in the transmitter (Alice) and an average of the multi-points in the training sequence is estimated to remove the influence of additive noise. Simulation results show that the compensation accuracy of the proposed method can reach 0.9932, which is 20% better than that based on traditional method. Our method can significantly reduce the influence of additive noise, and improve the system performance by controlling excess noise in phase compensation process.
11905-36
Author(s): Ding-Mei Zhang, Jingchu Univ. of Technology (China); Zai-Fu Jiang, Yan-Lin Deng, Jingchu University of technology (China); Yan-Li Li, Jingchu Univ. of Technology (China); Wen-Yan Yang, Chongqing University of Science and Technology (China); Ze-Ben Xiong, Jingchu University of technology (China)
On demand | Presented Live 11 October 2021
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Based on the three-energy level exciton model of the quantum dot lasers (QDLs), the nonlinear dynamics of the sole ground-state emitting QDL (GS-QDL) under external optical injection is numerically studied. The results show that the GS-QDL can generate period-one, period-two, multi-period, chaotic pulse and injection locking states under suitable injection parameters. By analyzing the distribution of these dynamic states in the injection parameter space, it is found that the period-one state and injection locking state occupy a large area, but the region of the complex dynamics is relatively small. Moreover, the complexity of the chaotic signals generated by the GS-QDL is quantified by the permutation entropy calculation. The results show that the complexity of the chaotic signals is less than 0.90, which indicates that the GS-QDL is low sensitivity to external optical injection. The GS-QDL can be used in isolator-free photonic integrated circuits.
11905-37
Author(s): Xia Wang, Xunmin Zhu, Nan Li, Mengzhu Hu, Wenqiang Li, Xingfan Chen, Huizhu Hu, Zhejiang Univ. (China)
On demand | Presented Live 11 October 2021
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Levitated microspheres have enabled a wide variety of precision sensing applications which have caught great attentions in recent years. Optical tweezers technology is one of the most important methods of microspheres levitation. The stability of laser power directly affects the microspheres levitation and the precision of the measurement. This paper discusses the major factors of power stabilization in semiconductor laser. A PID-controlled model is used to control the feedback on the laser. The system mode is established after the analyzing of the characteristic of the model parameters. The experiment is demonstrated with a commercial semiconductor laser. With the external power stabilization module a 16dB laser power stability control is achieved at the relaxation oscillation, and the long-term stability is improved from 3% to 0.4%.
11905-38
Author(s): Heng Wang, Institute of Southwestern Communication (China); Xiaolan Liu, Beijing Jinghang Research Institute of Computing and Communication (China); Yaodi Pi, Yun Shao, Yan Pan, Wei Huang, Yang Li, Bingjie Xu, Institute of Southwestern Communication (China)
On demand | Presented Live 11 October 2021
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In this paper, a frequency-shifted-assisted continuous variable quantum key distribution with local local oscillator (LLO-CVQKD) scheme is proposed based on Gaussian modulated coherent state. In the proposed scheme, the quantum signal and pilot tone can be completely isolated in frequency domain by frequency-shifting quantum optical carrier, so that the crosstalk from strong pilot tone to weak quantum signal can be effectively eliminated compared with our former pilot-tone scheme based on CS-DSB modulation. Moreover, an improved phase noise compensation scheme based on pilot-tone-assisted phase calibration and adaptive phase rotation is proposed for eliminating the dominate phase noise without the help of any training sequences, which promotes the blocks of the quantum key. Besides, a low level of excess noise is experimentally obtained for supporting the secure key rate of 7.15 Mbps over secure transmission distance of 25 km, verifying the simple and high-rate LLO-CVQKD.
11905-39
Author(s): Yaodi Pi, Heng Wang, Yan Pan, Yun Shao, Wei Huang, Bingjie Xu, Institute of Southwestern Communication (China)
On demand | Presented Live 11 October 2021
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In this paper, a high-rate Gaussian-modulated coherent-state (GMCS) continuous-variable quantum key distribution (CV-QKD) scheme with a local local oscillator is experimentally demonstrated. The transmission of quantum signal and pilot tone in optical fiber adopts frequency and polarization multiplexing technology. By optimizing frequency bandwidth, modulation variance and intensity of the pilot tone, the CVQKD system is demonstrated at different metropolitan distance, and the secure key rate of 13.53Mbps, 8.24Mbps, 5.39Mbps 3.66Mbps and 2.55Mbps over transmission distance of 5km, 10km, 15km, 20km and 25km are obtained, respectively.
11905-41
Author(s): Yun Shao, Institute of Southwestern Communication (China); Wei Huang, Institute of Southwestern Communicationommunication (China); Haoyu Wang, CNPC Jichai Power Company Limited Chengdu Compressor Branch (China); Yang Li, Heng Wang, Yan Pan, Yaodi Pi, Li Ma, Chenlin Zhang, Bingjie Xu, Institute of Southwestern Communication (China)
On demand | Presented Live 11 October 2021
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We propose a practical phase-reference intensity attack scheme using a phase-insensitive amplifier to amplifier the intensity of the phase-reference intensity. In this case, In this case, the eavesdropper can compromise the security of the LLO CV-QKD system severely by lowering the trusted part of the phase noise to compensate her increased attack on the signal pulse when the total excess noise is unchanged. We simulate the secure key rate with respect to the transmission distance to show that precisely monitoring the instantaneous intensity of the phase-reference pulse in real time is of great importance to guarantee the security of the LLO CV-QKD system.
11905-42
Author(s): Xin-Di Wang, Zi-Ye Gao, Guang-Qiong Xia, Zheng-Mao Wu, Southwest Univ. (China)
On demand | Presented Live 11 October 2021
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Based on a four-level rate equation model, we numerically simulated the nonlinear dynamics of a diode-pumped solid-state passively Q-switched laser. A Nd:YAG and a Cr4+:YAG is used as the gain medium and the saturable absorber in this system, respectively. Through setting the pumping rate or the round-trip optical loss at different values, the diode-pumped solid-state passively Q-switched Nd:YAG/Cr4+:YAG laser may operate at the period-one, period-two, multi-period or chaotic states. For a certain specific state, the time series, the power spectra and the Poincare´ maps are represented. Moreover, the route for the diode-pumped solid-state passively Q-switched Nd:YAG/Cr4+:YAG laser entering into chaos is revealed by mapping the bifurcation.
11905-43
Author(s): Shiqing Tang, Hengyang Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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A two-qubit quantum swap gate scheme based on coherent state qubit is proposed in cavity quantum electrodynamics system by one step. It is found that under the condition of large detuning limit, the excited states of atoms are adiabatically eliminated, and the decoherence caused by the spontaneous emission of atoms is effectively suppressed. The fidelity of the quantum logic gate is maintained at a very high level when the photon loss of the cavity field is considered.
11905-44
Author(s): Haixin Bi, Yan-Ling Xue, East China Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Superchannel communication system is highly vulnerable to the fiber nonlinear effects because of high-order modulation formats and high input power. The modeling of nonlinear propagation in EDFA is the key research topic of superchannel communication. In this letter, based on the semi-classical theory, we model the density matrix equations for the C-band EDFA and obtain the propagation equations of the signal field and CW pumping wave. The analyses show that the crosstalk occurs between comb teeth and energy transfers from the low-frequency teeth to high-frequency teeth due to the multi-wave mixing stimulated by the resonantly enhanced nonlinearity of erbium ions. The results validate the nonlinearity increases monotonically with increasing baud rata and show that advanced modulation and multiple carriers technology is significance for decreasing the baud rate in the fiber to improve the transmission quality.
11905-45
Author(s): Meng Li, Qihuang Gong, Yan Li, Peking Univ. (China)
On demand | Presented Live 11 October 2021
11905-46
Author(s): Wen Zhao, Nan Huo, Liang Cui, Tianjin Univ. (China); Zheyu Ou, Tianjin Univ. (China), Indiana Univ.-Purdue Univ. Indianapolis (United States); Xiaoying Li, Tianjin Univ. (China)
On demand | Presented Live 11 October 2021
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The visibility of Hong-Ou-Mandel (HOM) interferometer is mainly determined by the mode matching of two interfering fields. To demonstrate how the dispersion of optical fiber influence the spectrum of temporal modes in different orders, we study the dependence of the visibility of HOM interference when two inputs fields are obtained by respectively propagating two optical fields with identical TM through two pieces optical fibers to achieve various kinds of unbalanced dispersion. Our investigation paves the way for implementing the distribution of temporally multiplexed quantum states over long distance fibers.
11905-47
Author(s): Yan Pan, Heng Wang, Yaodi Pi, Yun Shao, Wei Huang, Yang Li, Bingjie Xu, Institute of Southwestern Communication (China)
On demand | Presented Live 11 October 2021
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A polarization demultiplexing algorithm for CV-QKD system based on Stokes space is proposed and experimentally demonstrated. In the CV-QKD system, the pilot tone and quantum signal is modulated on the two orthogonal states of polarization (SOP), respectively. The K-means algorithm is used to find the coordinate of the cluster point, and the polarization rotation angles can be obtained by the coordinate. The advantages of the proposed algorithm are fast convergence, simple computation and modulation format independence. Experimental results of 100 MHz pilot-tone-assisted Gaussian-modulated CV-QKD system with local local oscillator (LLO) are given, and the results show that the proposed algorithm split the pilot-tone and quantum signal effectively. Furthermore, experimental results show that the proposed algorithm can track SOP scrambling of ≥3141.59 rad/s without sacrificing the performance of excess noise, which is satisfying for most scenarios of the LLO CV-QKD system.
11905-48
Author(s): Qiqi Bai, Jing Zhang, Xiaofeng Wang, Peide Zhao, Yong Zhang, Hebei Univ. of Technology (China)
On demand | Presented Live 11 October 2021
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Lorentz quantum impedance oscillator is a model which introduces the Bohr-Sommerfeld conditions of hydrogen-like atoms and the one- and two-photon absorption selection rules of quantum mechanics into the Lorentz oscillator. This model relates the electron transition process to the resonance absorption of the Lorentz Oscillator, and unifies the natural frequency of the oscillator and the intrinsic frequency of the electron transition; A formula for calculating the parameters of the oscillator in terms of the electric quantity and mass of the electron, the Bohr radius, and the effective quantum number is given; According to the Boltzmann distribution of thermodynamics, an expression for the oscillator strength of the oscillator in the equilibrium state of light emission and absorption is presented. Based on this model and considering that "electron pair" is one of the chemical bonds, the absorption Spectra and cross sections of TPAT-AN-XFand ASPI were simulated numerically.
11905-49
Author(s): Xiaojiong Chen, Yaohao Deng, Shuheng Liu, State Key Lab. of Artificial Microstructure and Mesoscopic Physics, Peking Univ. (China); Tanumoy Pramanik, State Key Lab. of Artificial Microstructure and Mesoscopic Physics, Peking Univ. (China), Beijing Academy of Quantum Information Sciences (China); Jun Mao, Jueming Bao, Chonghao Zhai, Tianxiang Dai, Huihong Yuan, Jiajie Guo, State Key Lab. of Artificial Microstructure and Mesoscopic Physics, Peking Univ. (China); Shao-Ming Fei, Capital Normal Univ. (China); Marcus Huber, Institut für Quantenoptik und Quanteninformation ÖAW (Austria), Vienna Ctr. for Quantum Science and Technology (Austria); Bo Tang, Yan Yang, Zhihua Li, Institute of Microelectronics (China); Qiongyi He, Qihuang Gong, Jianwei Wang, State Key Lab. of Artificial Microstructure and Mesoscopic Physics, Peking Univ. (China), Beijing Academy of Quantum Information Sciences (China), Frontiers Science Ctr. for Nano-optoelectronics (China)
On demand | Presented Live 11 October 2021
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Bohr’s complementarity is one central tenet of quantum physics. The paradoxical wave-particle duality of quantum matters and photons has been tested in Young’s double-slit (double-path) interferometers. The object exclusively exhibits wave and particle nature, depending measurement apparatus that can be delayed chosen to rule out too-naive interpretations of quantum complementarity. All experiments to date have been implemented in the double-path framework, while it is of fundamental interests to study complementarity in multipath interferometric systems. Here we demonstrate generalised multipath wave-particle duality in a quantum delayed-choice experiment, implemented by large-scale silicon-integrated multipath interferometers. Single-photon displays sophisticated transitions between wave and particle characters, determined by the choice of quantum-controlled generalised Hadamard operations. We characterise particle-nature by multimode which-path information and wave-nature by multipa
11905-50
Author(s): Hua Liu, Luoyang Electro-optical Equipment Research Institute (China); Quanxin Ding, Science and Technology on Electro-Optic Control Lab. (China), Luoyang Institute of Electro-optical Equipment of AVIC (China)
On demand | Presented Live 11 October 2021
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The principle approach, modeling, and error analysis are analyzed, and the system configuration based on freeform is advanced in algorithm analysis. For to improve the resolution of the imaging system, and achieve the theoretical limit, we introduced the technology principle of super resolution restructure from the point of view on theory and engineering. Three kinds of restructure technologies, that prototype, micro scanning and sub pixel are described, and how to decrease their shortcomings are discussed in detail. Furthermore, to improve the band width by reconstruction without the spectral alias in super resolution technologies, a new coding technology combining a optical encoding and the sub pixel is proposed. With the global method, the bandwidth has been amplified by ten times as compared with that of traditional ones. Simulation results show that the system can meet the application requirements in MTF, REA, RMS and other related criteria. Moreover, the system has reduced in vol
11905-51
Author(s): Shiqing Tang, Si Luo, Hengyang Normal Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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A very simple theoretical scheme is proposed to directly implement multiqubit controlled-phase gate by one step, which only use a single resonant interaction between ladder-type three-level atoms and the single-mode cavity. The gate operation can be completed directly in one step only through a single transition, without the use of single qubit rotation manipulation. The fidelity of the multiqubit phase gate is maintained at a high level when we take into account of the atomic spontaneous emission, the decay of the cavity-mode, and deviation of the coupling strength.
11905-52
Author(s): Xin Tan, Ya Liu, Yongkang Zheng, Zewu Xie, Jie Yang, Yunnan Normal Univ. (China)
On demand | Presented Live 11 October 2021
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In this paper, by utilizing a same tungsten trioxide (WO3) film as SAs, a passively mode-locked and a passively Q-switched erbium-doped fiber laser are demonstrated respectively. The WO3-SA was fabricated on a polymer composite film and sandwiched between two fiber ferrules with an insertion loss of 1.5 dB at 1550 nm. When the WO3-SA was employed to provide the unique pulse narrowing effect, Q-switched pulses were observed with a repetition rate of 68 kHz and a pulse width of 2 μs. The 3-dB spectral bandwidth and the repetition rate of mode-locked pulses are about 6 nm and 24 MHz respectively. The pulse train is stable with a signal to noise ratio of 60 dB. The results indicated that a SA for Q-switching could realize mode-locking with additional nonlinear pulse narrowing effect, such as nonlinear polarization rotation, which would reduce the threshold of absorption parameters of SAs.
11905-55
Author(s): Igor Korel, Novosibirsk State Technical Univ. (Russian Federation); Boris N. Nyushkov, Novosibirsk State Univ. (Russian Federation); Anastasia Kutishcheva, Novosibirsk State Technical Univ. (Russian Federation); Sergey M. Kobtsev, Novosibirsk State Univ. (Russian Federation)
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We present an energy-efficient method for conversion of relatively long (nanosecond) optical pulses into an extraordinary light structure – a packet of ordered picosecond pulses which differs from the known types of ordered ultrashort pulse patterns (like soliton molecules). The method relies on revealed peculiarities of nonlinear evolution of an ultrashort dark pulse implanted in a background nanosecond pulse when they propagate in an optical fiber. Under certain conditions, energy of the background nanosecond pulse, which initially hosts a single ultrashort dark pulse, can be nearly completely converted into a structured packet of ultrashort high-peak-power bright pulses.
11905-56
Author(s): Sergey M. Kobtsev, Novosibirsk State Univ. (Russian Federation)
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Properties of noise-like pulses are analysed from the viewpoint of their employment as radiation carriers with relatively high energy. The difference from the well-known method of chirped pulse amplification consists in that instead of temporal stretching of a pulse prior to amplification, this technology relies upon redistribution of the pulse energy among components of a relatively long structured pulse. The fundamental principles of these two approaches are similar and constitute reduction of radiation load (across a surface or volume) at a given moment in time. The prospects of the new method are discussed.
11905-57
Author(s): Vladislav Efremov, Institute of Automation and Electrometry (Russian Federation), Novosibirsk State Univ. (Russian Federation); Aleksandr Antropov, Ekaterina Evmenova, Institute of Automation and Electrometry (Russian Federation); Denis Kharenko, Institute of Automation and Electrometry (Russian Federation), Novosibirsk State Univ. (Russian Federation)
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Numerical simulation of the fiber optic parametric oscillator aiming the goal to produce picosecond narrowband pulses for CARS-spectroscopy has been performed in an extremely wide range of parameters, such as a pump pulse duration, frequency shift, spectral bandwidth of the pump and parametric pulses. It required extremely large calculation window both in time (3.5 ns) and spectral (from 433 nm to 3100 nm) domains. We managed to speed up simulation in fifty times by graphic processor unit, which allowed to define the areas of stability, for different lengths of standard passive and photonic-crystal fibers used in the external cavity.
11905-58
Author(s): Qiandong Ran, Nanyang Technological Univ. (Singapore); Hao Li, Singapore Institute of Manufacturing Technology (Singapore); Qi Jie Wang, Nanyang Technological Univ. (Singapore); Ying Zhang, Singapore Institute of Manufacturing Technology (Singapore)
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High energy pulse self-compression's dependence on the input pulse group delay dispersion (GDD) and third order dispersion (TOD) is studied experimentally. Pulses with energy of 3 mJ, at a repetition rate of 1 kHz, with Fourier transform limited FWHM pulse duration of 24 fs from a Ti:sapphire laser amplifier system are focused into a 2 cm long, 150 μm inner diameter hollow core waveguide filled with 10 mbar argon gas. The input pulse GDD and TOD are tuned by an acousto-optic programmable dispersive filter in the laser amplifier system. We found that the pulses are optimally compressed along a diagonal line in the GDD-TOD plane, where the output pulses are near Fourier transform limited. However, along the other diagonal line the pulses are poorly compressed due to pre-pulses appearing. These findings will guide the self-compression of high energy pulse experiments in the future.
11905-59
Author(s): Alexey Y. Kokhanovskiy, Sergey Smirnov, Sergey M. Kobtsev, Novosibirsk State Univ. (Russian Federation)
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Numerical study of pulses formation inside embedded cavities of fiber mode-locked laser and Raman oscillator is presented. The major goal of this work is to analyze the regions of stable coexistence of two-color pulses, their improved coherent, spectral and temporal properties compared with those of conventional laser systems with extra-cavity Raman spectral converters. It was found that Raman pulses may act in controversial manner: they may destabilize or stabilize mode-locked pulses. We demonstrate the evolution of the coherence spikes of autocorrelation function of both pulses depending in cavity parameters such as: saturation power of saturable absorbers, bandwidth of spectral filters, power ratio of output couplers.
Session 1: Quantum Optics
In person: 11 October 2021 • 14:30 - 18:00 China Standard Time
Session Chair: Qiongyi He, Peking Univ. (China)
11905-1
Author(s): Xiaoying Li, Hongtao Cheng, Liang Cui, Jinjin Wang, Pengyu Gao, Tianjin Univ. (China); Zheyu Ou, Tianjin Univ. (China), Indiana Univ.-Purdue Univ. Indianapolis (United States)
In person: 11 October 2021 • 14:30 - 15:00 China Standard Time
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The success of many protocols in optical quantum information processing relies on the availability of photon states with a well-defined spatial and temporal mode. Photons in single spatial mode can be obtained from nonlinear processes in single-mode waveguides. Using the fiber-based nonlinear interferometry that separates the nonlinear gain control from dispersion engineering, we show a new approach of modifying the mode structure of quantum state. The quantum interferometric method can separate the control of mode structure from nonlinear interaction, leading to versatile and precise engineering of the spectral properties of quantum states.
11905-2
Author(s): Lijian Zhang, Nanjing Univ. (China)
In person: 11 October 2021 • 15:00 - 15:30 China Standard Time
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Quantum-enhanced sensing uses quantum resources like entanglement and squeezed states to achieve the precision and accuracy beyond that of the conventional schemes. One particular example is quantum illumination, which uses entanglement to enhance the detection of an object in the presence of background noise. We report an experimental demonstration of single-photon quantum illumination scheme. Compared to the optimum conventional illumination, the quantum scheme increases the accuracy of target detection for up to 40% and approaches the fundamental Helstrom limit. To extract detailed information of a target usually requires imaging. Using the theories of multi-parameter quantum metrology, we analyze the quantum-limited precision of two fundamental imaging tasks, locating a single emitter and resolving two emitters in the three-dimensional space. Our results may find wide applications from microscopy to astrometry.
11905-3
Author(s): Xiangdong Zhang, Lingjun Kong, Yifan Sun, Beijing Institute of Technology (China)
In person: 11 October 2021 • 15:30 - 16:00 China Standard Time
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Cryptography plays an important role in information security, which is widely applied in the various fields of society. Quantum cryptography has shown its great advantages in information security compared with the classical one. Two major directions of quantum cryptography are quantum key distribution (QKD) and quantum encryption, with the former focusing on secure key distribution and the latter focusing on encryption using quantum algorithms. In contrast to the well accepted success of the QKD, the development of quantum encryption is rather limited because of the difficulties of building up algorithms and the constructing the practical quantum computers. In this talk, we report a new scheme of quantum encryption based on high-dimensional entanglement holography.
11905-4
Author(s): Qin Wang, Xingyu Zhou, Jingyang Liu, Nanjing Univ. of Posts and Telecommunications (China)
In person: 11 October 2021 • 16:30 - 17:00 China Standard Time
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Among all present quantum key distribution protocols, the reference-frame-independent measurement-device-independent quantum key distribution (RFI-MDI-QKD) is standing out due to its high security and practicability, since it can not only remove all detector-side-channel attacks, but also relax the requirement of reference-frame calibrations. However, till today, the performance degradation of RFI-MDI-QKD caused by finite-size effects is one of the biggest impediments to its practical implementations. Here, we propose an enhanced RFIMDI-QKD protocol which is highly resistant to the finite-size effect and immensely boosts both the key rate and transmission distance. As a result, it can even surpass the most advanced MDI-QKD protocol under larger rotation angles of reference frames. Furthermore, with the state-of-the-art RFI-MDI-QKD setup, we successfully carry out a proof-of-principle experimental demonstration at a record distance of 300 km.
11905-5
Author(s): Wenjing Liu, Peking Univ. (China)
In person: 11 October 2021 • 17:00 - 17:30 China Standard Time
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Exciton-polaritons are half-light half-matter quasiparticles resulted from the strong coupling between excitons and photons. Exhibiting both high spatial and temporal coherence and strong inter-particle interactions, exciton polaritons serve as an unique platform for studying macroscopic quantum phenomena such as Bose-Einstein condensation and optical nonlinearities. Optical field engineering through photonic microcavities and nanostructures allows precise tailoring of the spin, momentum, angular momentum and topological properties of photons, thereby providing a great freedom for manipulating photon-exciton interactions. This talk will discuss recent progresses of exciton-polariton studies in two-dimensional photonic nanostructures including plasmonic metasurfaces and photonic crystals.
11905-6
Author(s): Yu Xiang, Shuheng Liu, Jiajie Guo, Peking Univ. (China); Nicolas Treps, Laboratoire Kastler Brossel (France); Qiongyi He, Peking Univ. (China); Mattia Walschaers, Laboratoire Kastler Brossel (France)
On demand | Presented Live 11 October 2021
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Wigner negativity, as a well-known indicator of nonclassicality, plays an essential role in quantum computing and simulation using continuous-variable systems. Recently, it has been proven that Einstein-Podolsky-Rosen steering is a prerequisite to generate Wigner negativity between two remote modes. Motivated by the demand of real-world quantum network, here we investigate the shareability of generated Wigner negativity in the multipartite scenario from a quantitative perspective. By establishing a monogamy relation akin to the generalized Coffman-Kundu-Wootters inequality, we show that the amount of Wigner negativity cannot be freely distributed among different modes. Moreover, we provide a general method to quantify the remotely generated Wigner negativity. Our results pave the way for exploiting Wigner negativity as a valuable resource for numerous quantum information protocols based on non-Gaussian scenario.
11905-7
Author(s): Mingtao Cao, National Time Service Ctr. (China); Félix Hoffet, Lab. Kastler Brossel, Sorbonne Univ. (France), Ecole Normale Supérieure, Univ. PSL (France), CNRS (France); Julien Laurat, Alexandra S. Sheremet, Lab. Kastler Brossel (France)
In person: 11 October 2021 • 17:45 - 18:00 China Standard Time
Session 2: Nonlinear Photonics I
In person: 12 October 2021 • 08:00 - 10:00 China Standard Time
Session Chair: Chuanshan Tian, Fudan Univ. (China)
11905-8
Author(s): Rui Ge, Yuping Chen, Xianfeng Chen, Shanghai Jiao Tong Univ. (China)
In person: 12 October 2021 • 08:00 - 08:15 China Standard Time
11905-9
Author(s): Lingxiao Shan, Juanjuan Ren, Qi Zhang, Yun Ma, Xueke Duan, Peking Univ. (China); Qihuang Gong, Peking Univ. (China), Yangtze Delta Optoelectronics Research Institute (China), Collaborative Innovation Ctr. of Extreme Optics, Shanxi Univ. (China); Gu Ying, Peking Univ. (China), Beijing Academy of Quantum Information Sciences (China), Collaborative Innovation Ctr. of Extreme Optics, Shanxi Univ. (China)
In person: 12 October 2021 • 08:15 - 08:30 China Standard Time
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Nanoscale non-classical light sources have become the key component of many on-chip quantum applications. Particularly, single photon and squeezing properties play a central role in quantum computing and sensing. So far, nanoscale single photon sources are realized in micropillar cavities and nanowires. However, squeezing light sources are scarce for on-chip devices, and the out-coupling of non-classical light is also limited in direct coupling to free space. We propose a nanoscale photonic-crystal-plasmonic system suitable for on-chip generation and transmission of non-classical light. A band-edge mode is utilized to establish strong coupling between optical mode and an emitter, which enables g^((2) ) (0)<0.1 and the degree of squeezing reaches 0.46 dB. The 2D line defect provides an effective channel to transmit the non-classical light with couping efficiency β~70%. The proposal provides a candidate for a versatile non-classical light source for on-chip applications.
11905-10
Author(s): Lu Sun, Nan Zhang, Weiwei Liu, Nankai Univ. (China)
On demand | Presented Live 12 October 2021
11905-11
Author(s): Hao Li, Lixing You, Chinese Academy of Sciences (China)
In person: 12 October 2021 • 08:45 - 09:00 China Standard Time
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We report on our recent work on superconducting nanowire single-photon detector (SNSPD) with near-unity system efficiency. We overcome the tradeoff between the photon absorption and responding and produce NbN SNSPDs with a near-unity system efficiency by replacing a single-layer nanowire with twin-layer nanowires on a dielectric mirror. The detector at 0.8 K shows a maximal system detection efficiency (SDE) of 98% at 1590 nm and a system efficiency of over 95% in the wavelength range of 1530–1630 nm. Moreover, the detector at 2.1K demonstrates a maximal SDE of 95% at 1550 nm using a compacted two-stage cryocooler. This type of detector also shows the robustness against various parameters, such as the geometrical size of the nanowire, and the spectral bandwidth, enabling a high yield of 73% (36%) with an SDE of >80% (90%) at 2.1K for 45 detectors fabricated in the same run. These SNSPDs made of twin-layer nanowires are of important practical significance for batch production.
11905-12
Author(s): Qingyuan Zhao, Nanjing Univ. (China)
In person: 12 October 2021 • 09:00 - 09:30 China Standard Time
11905-13
Author(s): Bo Chen, Jin Liu, Sun Yat-Sen Univ. (China)
In person: 12 October 2021 • 09:30 - 10:00 China Standard Time
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Twisted single photons constitute a high-dimensional quantum system with information processing abilities beyond the two-level single-photon qubits. We proposed an on-chip quantum source device in which single QDs are embedded in microring with angular gratings patterned along the inner wall. The orbital angular momentum (OAM) single photons are generated by coupling the spontaneous emission from QDs to the standing wave formed by interference from the clockwise and counterclockwise whispering gallery modes of the microring. Our results may contribute to the developments of high-dimensional quantum information processing with OAM states as an additional degree of freedom.
Session 3: Nonlinear Photonics II
In person: 12 October 2021 • 10:30 - 12:00 China Standard Time
Session Chair: Jin Liu, Sun Yat-Sen Univ. (China)
11905-14
Author(s): Chuanshan Tian, Fudan Univ. (China)
In person: 12 October 2021 • 10:30 - 11:00 China Standard Time
11905-15
Author(s): Wenjie Wan, Shanghai Jiao Tong Univ. (China)
In person: 12 October 2021 • 11:00 - 11:30 China Standard Time
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Fizeau experiment, inspiring Einstein’s special theory of relativity, reveals a small dragging effect of light inside a moving medium. Dispersion can enhance such light drag according to Lorentz’s prediction. Here slow and fast light enhanced light drag is demonstrated experimentally in a moving optical microcavity through stimulated Brillouin scattering induced transparency and absorption. The strong dispersion provides an enhancement factor up to ∼10^4, greatly reducing the system size down to the micrometer range. These results may offer a unique platform for a compact, integrated solution to motion sensing and ultrafast signal processing applications.
11905-16
Author(s): Daohong Song, Jingjun Xu, Zhigang Chen, Nankai Univ. (China)
In person: 12 October 2021 • 11:30 - 12:00 China Standard Time
Session 4: Quantum Technology With Atoms
In person: 12 October 2021 • 13:30 - 15:30 China Standard Time
Session Chair: Fang-Wen Sun, Univ. of Science and Technology of China (China)
11905-17
CANCELED: Unidirectional invisibility due to non-Hermitian symmetry breaking in photonic thermal atoms (Invited Paper)
In person: 12 October 2021 • 13:30 - 14:00 China Standard Time
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Unidirectional invisibility induced by Non-Hermitian Symmetry Breaking has been widely studied both theoretically and experimentally in photonic mesh lattices, periodic nanowires, multilayer structures, organic films, and electroacoustic resonators, and has attract great interests in the past few years. We theoretically and experimentally demonstrate the unidirectional invisibility in thermal atoms with tunable non-Hermitian photonics, of which the real and imaginary part of optical complex potential can be optically manipulated separately by pumping fields. Hence the Symmetry Breaking-induced exceptional points can be controlled by both of the intensities and phases of the fields, resulting in the unidirectional invisibility.
11905-18
Author(s): Liqing Chen, East China Normal Univ. (China)
In person: 12 October 2021 • 14:00 - 14:30 China Standard Time
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We will report on our latest results on atom-light hybrid system. First, we propose an atom-light hybrid gyroscope and memory-assisted quantum accelerometer based on atom-light quantum correlation, where the sensitivity can be achieved below shot noise limitation even considering the losses. Second, we reduce the mode mismatch noises in atom-light interactions via optimization of the temporal waveform. Then, we demonstrate an efficient broadband quantum memory with efficiency of 92% and only 0.1% noise, which is achieved by controlling on the temporal mode of strong driving pulse to optimize the spatial-mode of the atomic spin wave. The atom-light hybrid system can combine the advantage of atomic wave and optical wave, and could find wide applications in precision measurement and quantum control with atoms and photons.
11905-19
Author(s): Jietai Jing, East China Normal Univ. (China)
In person: 12 October 2021 • 14:30 - 15:00 China Standard Time
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Quantum light sources, including quantum entanglement and quantum correlation, have attracted great attention due to their important roles in fundamental quantum physics science and quantum information processing. In this talk, I will review our recent experimental progresses on the generation and application of quantum light sources based on atomic ensemble. We have constructed a series of novel quantum light sources [1-5] and have also applied them to implement several all-optical continuous variable quantum information protocols [6-8]. These experimental results have important application prospects and values in quantum communication and quantum precision measurement. [1] Phys. Rev. Lett. 123, 070506 (2019) [2] Phys. Rev. Lett. 124, 083605 (2020) [3] Phys. Rev. Lett. 124, 090501 (2020) [4] Phys. Rev. Lett. 125, 140501 (2020) [5] Phys. Rev. Lett. 123, 113602 (2019) [6] Nat. Commun. 11, 3875 (2020) [7] Phys. Rev. Lett. 126, 210507 (2021) [8] Phys. Rev. Lett. 126, 060503 (2021)
11905-20
Author(s): Heng Shen, Shanxi Univ. (China)
In person: 12 October 2021 • 15:00 - 15:30 China Standard Time
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Quantum interface between light and atoms serves as powerful tools for quantum technologies. Here I shall talk its application on non-Hermitian Quantum photonics, generation of non-classical light, non-reciprocity of light transport and quantum metrology. It offers opportunities for high-spatial resolution quantum sensing, and also for quantum simulations with coupled optical channels.
Session 5: Sensing
In person: 12 October 2021 • 16:00 - 17:30 China Standard Time
Session Chair: Jietai Jing, East China Normal Univ. (China)
11905-21
Author(s): Fang-Wen Sun, Univ. of Science and Technology of China (China)
In person: 12 October 2021 • 16:00 - 16:30 China Standard Time
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Light-matter interaction is the foundation of studies in nanophotonics and nanoelectronics. It can modify the local electromagnetic field. Here, we used the NV center in diamond as a noninvasive probe, and applied charge state depletion nanoscopy to detect the localized microwave field from an Ag nanowire at the nanoscale. We found that the microwave field can be localized to 291±10 nm, corresponding to a scale of 10^(-6) λ. Moreover, the microwave-spin interaction strength is highly enhanced by observing a 1.4X10^4 times enhancement of the Rabi oscillation frequency, corresponding to increasing the field intensity by 2.0X10^8 times. Such an extreme concentration of microwave field will further promote integrated quantum information processing, sensing and microwave photonics in a nanoscale system.
11905-22
Author(s): Changling Zou, Univ. of Science and Technology of China (China)
In person: 12 October 2021 • 16:30 - 17:00 China Standard Time
11905-23
Author(s): Qifan Yang, Peking Univ. (China)
In person: 12 October 2021 • 17:00 - 17:30 China Standard Time
Conference Chair
Peking Univ. (China)
Conference Chair
Ulsan National Institute of Science and Technology (Korea, Republic of)
Conference Chair
Chuan-Feng Li
Univ. of Science and Technology of China (China)
Program Committee
Nankai Univ. (China)
Program Committee
Univ. of Science and Technology of China (China)
Program Committee
Tamagawa Univ. (Japan)
Program Committee
Peking Univ. (China)
Program Committee
Shanxi Univ. (China)
Program Committee
Peking Univ. (China)
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