期刊
OPTICS EXPRESS
卷 28, 期 22, 页码 32882-32893出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.404611
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资金
- Applied Basic Research Program of Sichuan Province [2020YJ0482]
- National Natural Science Foundation of China [61702469, 61771439, 61901425, U19A2076]
- Sichuan Youth Science and Technology Foundation [2019JDJ0060]
- National Cryptography Development Fund [MMJJ20170120]
- CETC Fund [6141B08231115]
- Innovation Special Zone Funds [18-163-00-TS-004-040-01]
- Sichuan Province Science and Technology Support Program [2020YFG0289]
A high-speed Gaussian-modulated continuous-variable quantum key distribution (CVQKD) with a local local oscillator (LLO) is experimentally demonstrated based on pilot-tone-assisted phase compensation. In the proposed scheme, the frequency-multiplexing and polarization-multiplexing techniques are used for the separate transmission and heterodyne detection between quantum signal and pilot tone, guaranteeing no crosstalk from strong pilot tone to weak quantum signal and different detection requirements of low-noise for quantum signal and high-saturation limitation tbr pilot tone. Moreover, compared with the conventional CVQKD based on homodyne detection, the proposed LLO-CVQKD scheme can measure X and P quadrature simultaneously using heterodyne detection without need of extra random basis selection. Besides, the phase noise, which contains the fast-drift phase noise due to the relative phase of two independent lasers and the slow-drift phase noise introduced by quantum channel disturbance, has been compensated experimentally in real time, so that a low level of excess noise with a 25 km optical fiber channel (with 5 dB loss) is obtained for the achievable secure key rate of 7.04 Mbps in the asymptotic regime and 1.85 Mbps under the finite-size block of 10(7). (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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