Gbps key rate passive-state-preparation continuous-variable quantum key distribution within an access-network area  

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作  者:FEIYU JI PENG HUANG TAO WANG XUEQIN JIANG GUIHUA ZENG 

机构地区:[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,Center for Quantum Sensing and Information Processing,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China [3]Hefei National Laboratory,Hefei 230088,China [4]College of Information Science and Technology,Donghua University,Shanghai 201620,China

出  处:《Photonics Research》2024年第7期1485-1493,共9页光子学研究(英文版)

基  金:National Natural Science Foundation of China(61971276, 62101320);Innovation Program for Quantum Science and Technology (2021ZD0300703);Shanghai Municipal Science and Technology Major Project(2019SHZDZX01);Key R&D Program of Guangdong Province (2020B030304002)。

摘  要:The conventional Gaussian-modulated coherent-state quantum key distribution(QKD) protocol requires the sender to perform active modulations based on a true random number generator. Compared with it, the passive-state-preparation(PSP) continuous-variable quantum key distribution(CVQKD) equivalently performs modulations passively by exploring the intrinsic field fluctuations of a thermal source, which offers the prospect of chip integration QKD with low cost. In this paper, we propose and experimentally demonstrate a high-rate PSP-CVQKD scheme within an access-network area using high-bandwidth detectors in a continuous wave encoding and decoding way. By proposing effective methods for suppressing the noises during the PSP process and polarization multiplexing to decrease the photon leakage noises, we realize the high-intensity local oscillator transmission, thereby achieving coherent detection with high efficiency, low noise, and high bandwidth. The secure key rates over transmission distance of 5.005 km with and without consideration of the finite-size effect are 273.25 Mbps and 1.09 Gbps. The use of the PSP method boosts the asymptotic secret key rate of CVQKD to Gbps level for the first time, to our knowledge, within the range of the access network, which provides an effective and secure key distribution strategy for high-speed quantum cryptography access communication.

关 键 词:PASSIVE network distribution 

分 类 号:O413[理学—理论物理] TN918.4[理学—物理]

 

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