Article
Optics
Hua-Jian Ding, Xing-Yu Zhou, Chun-Hui Zhang, Jian Li, Qin Wang
Summary: The white-paper protocol can prove the security of MDI-QKD against source imperfections and/or side channels, but the side channels have a significant impact on the key rates.
Article
Physics, Multidisciplinary
Ximing Hua, Min Hu, Banghong Guo
Summary: This study presents a flexible multi-user quantum key distribution scheme based on a GHZ entangled state, which distributes keys among multiple users while being resistant to detection attacks. Simulation results show a secure distance of over 280 km between each user and the measurement device, with potential expansion to a multi-node multi-user network for increased communication distance.
Article
Multidisciplinary Sciences
Weilong Wang, Kiyoshi Tamaki, Marcos Curty
Summary: This study presents a general formalism to prove the security of MDI-QKD with leaky sources. By analyzing the finite-key security of different MDI-QKD schemes, it is shown that MDI-QKD is feasible as long as the sources are sufficiently isolated.
SCIENTIFIC REPORTS
(2021)
Article
Quantum Science & Technology
Guang Ping He
Summary: This study proposes an MDI-QKD protocol that only requires individual measurements and classical operations, reducing the technical requirements for Bob and Charlie during implementation.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Quantum Science & Technology
Yi-Hua Zhou, Shu-Fen Qin, Wei-Min Shi, Yu-Guang Yang
Summary: In this paper, a measurement-device-independent continuous variable semi-quantum key distribution protocol is proposed to address the high cost of quantum equipment and the difficulty of preparing discrete variable quantum states. By analyzing the prepared-measure model and the entanglement-based model, as well as performing numerical simulations, the secret key rate and other performance of the protocol are analyzed, demonstrating its advantages in achieving secure communication and maximum secret key rate.
QUANTUM INFORMATION PROCESSING
(2022)
Article
Multidisciplinary Sciences
Jie Gu, Xiao-Yu Cao, Yao Fu, Zong-Wu He, Ze-Jie Yin, Hua-Lei Yin, Zeng-Bing Chen
Summary: This study presents the adoption of the reference technique to demonstrate the security of an efficient four-phase measurement-device-independent QKD using laser pulses against potential source imperfections. Through characterization of source flaws, connection with experiments, and finite-key analysis against coherent attacks, the feasibility of the protocol is demonstrated, achieving a high secure key rate under channel loss.
Article
Engineering, Electrical & Electronic
Jing-Yang Liu, Xing-Yu Zhou, Chun-Hui Zhang, Hua-Jian Ding, Yi-Peng Chen, Jian Li, Qin Wang
Summary: A enhanced RFI-MDI-QKD protocol is proposed, which is highly resistant to finite-size effects and greatly boosts key rate and transmission distance. A proof-of-principle experimental demonstration at a record distance of 300km was successfully carried out, verifying the advantage and robustness of the present work under non-ideal conditions.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Hao Shu
Summary: Quantum key distribution (QKD) enables the establishment of a secure secret key based on physical laws. Recent research focuses on measurement-device-independent QKD (MDI-QKD) using insecure measurement devices, eliminating attacks on such devices. However, previous MDI-QKD protocols require joint measurements with low efficiency. Whether all QKD protocols can become measurement-device-independent remains a challenge.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Optics
Xiaodong Zheng, Peiyu Zhang, Renyou Ge, Liangliang Lu, Guanglong He, Qi Chen, Fangchao Qu, Labao Zhang, Xinlun Cai, Yanqing Lu, Shining Zhu, Peiheng Wu, Xiao-Song Ma
Summary: Integrated photonics offers a way to miniaturize and enhance the performance of quantum key distribution (QKD) devices, with single-photon detectors being a key element. By integrating detectors onto photonic chips and utilizing time-bin encoded qubits and optimal Bell-state measurements, the key rate of measurement-device-independent QKD (MDI-QKD) can be increased, laying the foundation for a QKD network with untrusted relays.
ADVANCED PHOTONICS
(2021)
Article
Optics
Cong Jiang, Xiao-Long Hu, Zong-Wen Yu, Xiang-Bin Wang
Summary: This study proposes a modified MDI-QKD protocol with phase post-selection, which eliminates the loopholes of detection devices using single-photon interference. The security of private phase announcement in the X basis is proven, and the phase post-selection method is applied to the double-scanning four-intensity MDI-QKD protocol. Numerical results demonstrate that the phase post-selection method significantly improves key rates at all distances. An accelerated method is also introduced to reduce the running time of global parameter optimization, making it practically useful in unstable channels.
PHOTONICS RESEARCH
(2022)
Article
Physics, Multidisciplinary
Georgi Bebrov
Summary: This paper presents a key expanding procedure that can increase the key rate of quantum key distribution protocols, improve efficiency, and ensure security. It can be combined with other solutions to achieve key rates that have not been obtainable so far.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Optics
Feng-Yu Lu, Peng Ye, Ze-Hao Wang, Shuang Wang, Zhen-Qiang Yin, Rong Wang, Xiao-Jua Huang, Wei Chen, De-Yong He, Guan-Je Fan-Yuan, Guang-Can Guo, Zheng-Fu Han
Summary: A practical hacking method is proposed to exploit the inaccurate decoy-state modulation in decoy-state measurement-device-independent quantum key distribution (MDI-QKD) systems, allowing eavesdroppers to obtain all final keys.
Article
Quantum Science & Technology
Li-Wen Hu, Chun-Mei Zhang, Hong-Wei Li
Summary: The advantage distillation (AD) technology is efficient in enhancing the performance of quantum key distribution (QKD). By inserting an additional AD step into measurement-device-independent QKD (MDI-QKD), the secret key rate and transmission distance can be significantly improved. When considering statistical fluctuations, extending the application of AD technology in practical MDI-QKD systems demonstrates great superiority in performance enhancement.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Optics
Jun-Lin Bai, Yuan-Mei Xie, Yao Fu, Hua-Lei Yin, Zeng-Bing Chen
Summary: The twin-field quantum key distribution overcomes the linear constraint of secret key rate capacity. However, the complex phase-locking and phase-tracking technique requirements hinder the real-life applications. The asynchronous measurement-device-independent (AMDI) QKD protocol, also known as the mode-pairing QKD protocol, can relax the technical requirements and maintain similar performance to the twin-field protocol.
Article
Optics
Yuan-Mei Xie, Bing-Hong Li, Yu-Shuo Lu, Xiao-Yu Cao, Wen-Bo Liu, Hua-Lei Yin, Zeng-Bing Chen
Summary: A heralded DIQKD scheme based on entangled coherent states is proposed to improve entangling rates, with the secret key rate significantly outperforming traditional schemes and surpassing capacity bounds, making it an important step towards realizing DIQKD and a promising candidate for entanglement swapping in the future quantum internet.
Article
Optics
Ya-Ping Ruan, Hao-Dong Wu, Shi-Jun Ge, Lei Tang, Zhi-Xiang Li, Han Zhang, Fei Xu, Wei Hu, Min Xiao, Yan-Qing Lu, Ke-Yu Xia
Summary: This study demonstrates an ultralow-power all-optical switching by exploiting the chiral interaction between light and optically active material in a Mach-Zehnder interferometer. The achieved switching extinction ratio is high and the power cost is significantly reduced, making it a promising approach for ultralow-power and ultrafast all-optical information processing.
Article
Physics, Multidisciplinary
Feihu Xu, Yu-Zhe Zhang, Qiang Zhang, Jian-Wei Pan
Summary: Device-independent QKD protocol with random postselection is proposed in this paper, where secret keys are extracted only from the postselected subset of outcomes, reducing error events and relaxing the threshold of required detection efficiency.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Xin Huang, Yu Hong, Zheng-Ping Li, Feihu Xu
Summary: This paper proposes a photon-efficient approach for FMCW LIDAR, utilizing single-photon detectors and neighboring pixel data to improve depth estimation accuracy, achieving high-quality 3D imaging in low-flux conditions.
Article
Optics
Hongqian Cao, Zengyong Liu, Danran Li, Zhenda Lu, Ye Chen, Fei Xu
Summary: In this study, an optical fiber-based magnetically-tuned graphene mechanical resonator (GMR) is demonstrated by integrating superparamagnetic iron oxide nanoparticles on the graphene membrane. The tension of the graphene membrane is tuned with a magnetic field to achieve a resonance frequency shift. A resonance frequency tunability of 23 kHz using a 100 mT magnetic field is achieved. The device provides a new way to tune a GMR with a non-contact force and has potential applications in weak magnetic field detection with improved sensitivity.
CHINESE OPTICS LETTERS
(2023)
Article
Optics
Wei Li, Likang Zhang, Hao Tan, Yichen Lu, Sheng-Kai Liao, Jia Huang, Hao Li, Zhen Wang, Hao-Kun Mao, Bingze Yan, Qiong Li, Yang Liu, Qiang Zhang, Cheng-Zhi Peng, Lixing You, Feihu Xu, Jian-Wei Pan
Summary: This article reports a QKD system that can generate keys at a record high rate of 115.8 Mb/s over a 10 km standard optical fiber and distribute keys over up to 328 km of ultralow-loss fiber. These abilities are attributed to a multipixel superconducting nanowire single-photon detector with an ultrahigh counting rate, an integrated transmitter that can stably encode polarization states with low error, a fast post-processing algorithm for generating keys in real time, and the high system clock rate operation. The results demonstrate the feasibility of practical high-rate QKD with photonic techniques, thus opening its possibility for widespread applications.
Article
Optics
Peng-Yu Jiang, Zheng-Ping Li, Wen-Long Ye, Yu Hong, Chen Dai, Xin Huang, Shui-Qing Xi, Jie Lu, Da-Jian Cui, Yuan Cao, Feihu Xu, Jian-Wei Pan
Summary: Single-photon LiDAR is a promising technology for high-precision 3D imaging in challenging weather conditions. Through optical optimization and photon-efficient imaging algorithms, an array-based single-photon LiDAR system was demonstrated to achieve depth and intensity imaging in dense fog over long distances. Real-time 3D imaging for moving targets was also demonstrated in mist weather conditions. The results indicate potential applications in vehicle navigation and target recognition.
Article
Optics
Chen Dai, Wei -long Ye, Chao Yu, Xin Huang, Zheng-ping LI, Feihu Xu
Summary: Single-photon LiDAR is widely used for various applications. However, the repetition period of the pulsed laser limits its ability to determine long-range distances. In this study, we propose a photon-efficient 3D imaging framework that allows high laser pulse repetition rates for long-range depth imaging without range ambiguity. By using only one laser period per pixel and utilizing information from neighboring pixels, we demonstrate the recovery of absolute depth maps at distances up to 13.8 km using minimal signal photons per pixel. We also show the real-time imaging capability of absolute distances of moving targets.
Article
Physics, Multidisciplinary
Wei Li, Likang Zhang, Yichen Lu, Zheng-Ping Li, Cong Jiang, Yang Liu, Jia Huang, Hao Li, Zhen Wang, Xiang-Bin Wang, Qiang Zhang, Lixing You, Feihu Xu, Jian-Wei Pan
Summary: We propose and demonstrate a new method to achieve twin-field quantum key distribution (TF-QKD) without the need for phase locking. By separating the communication time into reference frames and quantum frames, we establish a global phase reference using the reference frames and reconcile the phase reference efficiently using a tailored algorithm based on fast Fourier transform. We successfully demonstrate no-phase-locking TF-QKD from short to long distances over standard optical fibers, achieving high secret key rates and repeaterlike key rates. Our work provides a scalable and practical solution to TF-QKD, representing an important step towards its wide applications.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Li-Zheng Liu, Yue-Yang Fei, Yingqiu Mao, Yi Hu, Rui Zhang, Xu-Fei Yin, Xiao Jiang, Li Li, Nai-Le Liu, Feihu Xu, Yu-Ao Chen, Jian-Wei Pan
Summary: In this study, a full-period quantum phase estimation approach is proposed and demonstrated. The approach adopts Kitaev's phase estimation algorithm to eliminate phase ambiguity and uses GHZ states to obtain phase values. Through an eight-photon experiment, the estimation of unknown phases in a full period is achieved, and the phase super-resolution and sensitivity beyond the shot-noise limit are observed. This research provides a new way for quantum sensing and represents a solid step towards its general applications.
PHYSICAL REVIEW LETTERS
(2023)
Article
Instruments & Instrumentation
Chao Yu, Tianyi Li, Xian-Song Zhao, Hai Lu, Rong Zhang, Feihu Xu, Jun Zhang, Jian-Wei Pan
Summary: In this study, a 4H-SiC single-photon avalanche diode (SPAD) based free-running ultraviolet single-photon detector (UVSPD) with ultralow afterpulse probability is reported. A beveled mesa structure is designed and fabricated for the 4H-SiC SPAD, which shows the characteristic of ultralow dark current. A readout circuit of passive quenching and active reset with a tunable hold-off time setting is further developed to significantly suppress the afterpulsing effect. The nonuniformity of photon detection efficiency (PDE) across the SPAD active area is investigated for performance optimization. The compact UVSPD shows a PDE of 10.3%, a dark count rate of 133 kcps, and an afterpulse probability of 0.3% at 266 nm, indicating its potential for practical ultraviolet photon-counting applications.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Engineering, Electrical & Electronic
Zhu Runze, Xu Fei
Summary: Multimode fiber (MMF) imaging, as a novel optical fiber imaging method, has the advantages of small device size, high resolution, large information capacity, and minimal invasion. It has the potential to become a new generation of high-resolution and low-invasive endoscope.
LASER & OPTOELECTRONICS PROGRESS
(2023)
Article
Computer Science, Artificial Intelligence
Jiayong Peng, Zhiwei Xiong, Hao Tan, Xin Huang, Zheng-Ping Li, Feihu Xu
Summary: Photon-efficient imaging using single-photon sensors to capture 3D images faces challenges of low photon counts/SBR and multiple returns. This paper proposes a unified deep neural network that tackles these challenges and simultaneously recovers depth and intensity information from photon-efficient measurements. The network exploits long-range correlations and incorporates a noise prior block to improve reconstruction performance. The proposed network achieves superior results under low photon counts/SBR and heavy blur, outperforming existing methods. Moreover, it generalizes well to real-world imaging systems.
IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Feng Xu, Song Zhou, Jiahui Zhang, Guanghui Wang, Fei Xu
Summary: An optically levitated conveyor belt based on specular-reflection photonic nanojet (s-PNJ) is proposed, where trapped particles can suspend in water and transport through the movement of hot spots caused by deflected light. The rate of successful particle transportation can reach up to 96.3% after a distance of 50 μm with a power intensity as low as 0.2 mW/μm².
2022 IEEE 7TH OPTOELECTRONICS GLOBAL CONFERENCE, OGC
(2022)
Article
Engineering, Electrical & Electronic
Jianjiang Liu, Yijun Zhou, Xin Huang, Zheng-Ping Li, Feihu Xu
Summary: Non-line-of-sight (NLOS) imaging techniques have the ability to look around corners, which attracts growing interest for diverse applications. This paper proposes a photon-efficient method to recover hidden scenes using only one detected photon at each scanning point. The method estimates the intensity information and utilizes convex optimization with joint regularization terms to recover the 3D information of the hidden scene. Simulations and experiments show that this method outperforms previous approaches under low-flux conditions.
IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING
(2022)
Article
Optics
Danran Li, Nina Wang, Tianyang Zhang, Guangxing Wu, Yifeng Xiong, Qianqian Du, Yunfei Tian, Weiwei Zhao, Jiandong Ye, Shulin Gu, Yanqing Lu, Dechen Jiang, Fei Xu
Summary: The research introduces a label-free nanosensor based on a fiber taper and zinc oxide nanogratings which enables monitoring of internal cellular apoptosis processes. It not only contributes to understanding internal environmental variations during cellular apoptosis, but also provides a new platform for investigating cellular events and understanding fundamental cell biochemical engineering with nonfluorescent fiber devices.
ADVANCED PHOTONICS
(2022)
