期刊
QUANTUM INFORMATION PROCESSING
卷 22, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1007/s11128-023-03993-4
关键词
CV-MDI QKD; Non-ideal Bell detection; Angle error; Secret key rate; Transmission distance
Continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD), with Bell detection as its core, can effectively defend against attacks on the detection system. However, in CV-MDI QKD, the untrustworthiness of Charlie and non-ideal Bell detection caused by the external environment create security vulnerabilities. We conducted a comprehensive security analysis of non-ideal Bell detection caused by non-orthogonal measurement. Simulation results show that even a 1-degree angle error can lead to a decrease in transmission distance by 7 km. Therefore, our research further enhances and improves the security of CV-MDI QKD.
Continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD), whose core is Bell detection, can effectively resist attacks on the detection system. However, in CV-MDIQKD, Charlie is untrusted; the external environment will cause non-ideal Bell detection that will open security loopholes. We give a complete security analysis under non-ideal Bell detection caused by on-orthogonal measurement. The simulation results indicate that compared with no angle error, only 1 degrees angle error will cause the transmission distance to drop by 7 km. Therefore, our research further improves and perfects the security of CV-MDI QKD.
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