量子密钥分配
光学
物理
量子信道
透射率
本振子
频道(广播)
自由空间光通信
计算机科学
电信
光通信
量子信息
量子
相位噪声
量子力学
光子
作者
Mingqi Zhang,Peng Huang,Ping Wang,Shurong Wei,Guihua Zeng
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2023-01-27
卷期号:48 (5): 1184-1184
被引量:21
摘要
Passive-state-preparation (PSP) continuous-variable quantum key distribution (CVQKD) protocol explores the intrinsic field fluctuations of a thermal source. Compared with traditional Gaussian-modulated coherent-state CVQKD, it does not need active modulations and has promising applications in chip integration and portable free-space quantum key distribution. In this Letter, we propose and experimentally realize a PSP CVQKD scheme with transmitted local oscillator (LO) through fluctuating transmittance free-space channel using an off-the-shelf amplified spontaneous emission source for the first time. By proposing thermal-state polarization multiplexing transmitted LO, synchronized channel transmittance monitoring and fine-grained phase compensation techniques, secure keys within −15 dB transmittance of simulated free-space channel with turbulence are generated, with a final average secure key rate of 1.015 Mbps asymptotically. Equivalent atmospheric turbulence model analysis shows that the free-space PSP CVQKD scheme provides a promising outlook for high-speed and chip-based CVQKD for kilometer-level atmospheric channel networks.
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