Sending-or-not-sending quantum key distribution with phase postselection
arxiv(2024)
摘要
Quantum key distribution (QKD) could help to share secure key between two
distant peers. In recent years, twin-field (TF) QKD has been widely
investigated because of its long transmission distance. One of the popular
variants of TF QKD is sending-or-not-sending (SNS) QKD, which has been
experimentally verified to realize 1000-km level fibre key distribution. In
this article, the authors introduce phase postselection into the SNS protocol.
With this modification, the probability of selecting "sending" can be
substantially improved. The numerical simulation shows that the transmission
distance can be improved both with and without the actively odd-parity pairing
method. With discrete phase randomization, the variant can have both a larger
key rate and a longer distance.
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