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High-performance long-distance discrete-modulation continuous-variable quantum key distribution
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DOI：10.1364/OL.492082.png)
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Abstract
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We experimentally demonstrate a high-rate discretely mod-ulated continuous-variable quantum key distribution over 80-km standard single-mode fiber with a 2.5 Gbaud, 16 -symbol, two-ring constellation. With the help of well -designed digital signal processing algorithms, the excess noise of the system can be effectively suppressed. The achieved secret key rates are 49.02 Mbits/s, 11.86 Mbits/s, and 2.11 Mbits/s over 25-km, 50-km, and 80-km optical fiber, respectively, and achieve 67.4%, 70.0%, and 66.5% of the secret key rate performance of a Gaussian-modulated protocol. Our work shows that it is feasible to build a high-performance, long-distance continuous-variable quantum key distribution system with only a small constellation size. (c) 2023 Optica Publishing Group
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