期刊
NEW JOURNAL OF PHYSICS
卷 21, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ab5a97
关键词
quantum key distribution; twin-field quantum key distribution; finite-key size effect
资金
- National Key Research and Development Program of China [2016YFA0302600]
- National Natural Science Foundation of China [61822115, 61775207, 61702469, 61771439, 61622506, 61627820, 61575183]
- National Cryptography Development Fund [MMJJ20170120]
- Anhui Initiative in Quantum Information Technologies
Twin-field quantum key distribution(TF-QKD) protocol and its variants, such as phase-matching QKD, sending-or-not-sending QKD and no phase post-selection TF-QKD(NPP-TFQKD), are very promising for long-distance applications. However, there are still some gaps between theory and practice in these protocols. Concretely, a finite-key size analysis is still missing, and the intensity fluctuations are not taken into account. To address the finite-key size effect, we first give the key rate of NPP-TFQKD against collective attack in finite-key size region and then prove it can be against coherent attack. To deal with the intensity fluctuations, we present an analytical formula of 4-intensity decoy state NPP-TFQKD and a practical intensity fluctuation model. Finally, through detailed simulations, we show NPP-TFQKD can still keep its superiority of high key rate and long achievable distance.
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