期刊
QUANTUM INFORMATION PROCESSING
卷 21, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1007/s11128-022-03464-2
关键词
Quantum information; Quantum encryption; Single-photon entanglement; Wave-particle duality
资金
- China Postdoctoral special funding project [2020T130289]
- National Natural Science Foundation of China [61871234]
In this paper, we propose an extended SEPM-QKD protocol with the help of delocalized state measurement. The proposed scheme improves the key rate and extends the communication distance.
Twin-field quantum key distribution (TF-QKD) is a hot topic in the field of quantum information due to its potential to break the key rate linear bound. Among all the variants, the single-photon entanglement-based phase-matching QKD protocol (SEPM-QKD) has been proposed, which is an entangled version of TF-QKD. However, a significant defect of SEPM-QKD is that its key rate is much lower than other QKDs. In this paper, we proposed an extended SEPM-QKD protocol with the help of delocalized state measurement. The proposed scheme can be regarded as TF-QKD connected by a single-photon entanglement-based quantum repeater. A security proof based on entanglement purification protocol in wave-state space against all channel attacks has been presented. Violation of CHSH-type Bell's inequality is used to test the delocalized quantum correlation of the source. The simulation results show that the key rate of extended SEPM-QKD has the same performance as phase-matching (PM)-QKD and TF-QKD, while the communication distance is almost twice that of them.
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