Unidimensional continuous-variable quantum key distribution with noisy source
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We investigate the security of unidimensional continuous-variable quantum key distribution with source noise at the sender. The source noise is ascribed to the legitimate sides rather than the eavesdropper and modeled as a thermal noise coupled with the signal mode through a beam splitter. The physicality bound and expressions of secret key rate are derived against collective entangling cloner attacks. Simulation results show that with source noise, the security bound of unidimensional protocol can be tightened. Moreover, proper source noise enlarges the security region to a wider range of parameters, thus eliminates potential eavesdropping threats and enhances the feasibility of unidimensional protocol.
KeywordsQuantum key distribution Continuous variable Unidimensional Source noise
The work is supported in part by the Natural Science Foundation of China (No. 61865002), in part by the Major Project of Guizhou Province (No. 3022), in part by the Science & Technology Cooperation Project of Guizhou Province (No. 7002, No. 7431) and in part by the Scientific Research Foundation for Talent Introduced in Guizhou University (No. 45).
- 21.Holevo, A.S.: Bounds for the quantity of information transmitted by a quantum communication channel. Probl. Inf. Transm. 9, 177–183 (1973)Google Scholar