Sending-or-not-sending quantum key distribution with phase postselection
Abstract: 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.
- H.-K. Lo and H. F. Chau, Unconditional security of quantum key distribution over arbitrarily long distances, Science 283, 2050 (1999).
- P. W. Shor and J. Preskill, Simple proof of security of the bb84 quantum key distribution protocol, Phys. Rev. Lett 85, 441 (2000).
- W. K. Wootters and W. H. Zurek, A single quantum cannot be cloned, Nature 299, 802 (1982).
- M. Takeoka, S. Guha, and M. M. Wilde, Fundamental rate-loss tradeoff for optical quantum key distribution, Nature communications 5, 5235 (2014).
- X. Ma, P. Zeng, and H. Zhou, Phase-matching quantum key distribution, Physical Review X 8, 031043 (2018).
- X.-B. Wang, Z.-W. Yu, and X.-L. Hu, Twin-field quantum key distribution with large misalignment error, Physical Review A 98, 062323 (2018).
- J. Lin and N. Lütkenhaus, Simple security analysis of phase-matching measurement-device-independent quantum key distribution, Physical Review A 98, 042332 (2018).
- M. Curty, K. Azuma, and H.-K. Lo, Simple security proof of twin-field type quantum key distribution protocol, npj Quantum Information 5, 64 (2019).
- W.-Y. Hwang, Quantum key distribution with high loss: toward global secure communication, Physical review letters 91, 057901 (2003).
- H.-K. Lo, X. Ma, and K. Chen, Decoy state quantum key distribution, Phys. Rev. Lett. 94, 230504 (2005).
- X.-B. Wang, Beating the photon-number-splitting attack in practical quantum cryptography, Physical review letters 94, 230503 (2005).
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