WCSE

Analysis on the Effect of Polarization Drift on the Efficiency of Generating Keys in a Quantum Communication System Based on the B92 Protocol

Abstract— Focusing on the polarization drift in a practical quantum communication system, analyze the effect on the efficiency of producing key and mutual information in a quantum communication system based on B92 protocol. Results show that when the polarization drift angle is 0°, the probability receiver can obtain measurement respond comes to minimum value: 0.25, while the mutual information between the sender and the receiver gets the maximum value: 1; When the angle is 90°, the probability reaches the maximum value: 0.75, while the mutual information gets the minimum value: 0.0817; The probability receiver correctly measures the state actually is constantly 0.25. Comparing to BB84, the variation of mutual information in B92 is violent from 0.0817 to 1.

Index Terms— B92 protocol; quantum communication; polarization drift; quantum key distribution.

Zhiyong Zhang, Yanbo Wang, Min He, Yong Zhu, Zhiyong Xu, Jian Wang
Institute of Communication Engineering, PLA University of Science and Technology, CHINA
Liucun Cao
Zibo City Public Security Bureau, CHINA

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Cite: Zhiyong Zhang, Yanbo Wang, Min He, Yong Zhu, Zhiyong Xu, Jian Wang, Liucun Cao, "Analysis on the Effect of Polarization Drift on the Efficiency of Generating Keys in a Quantum Communication System Based on the B92 Protocol," 2015 The 5th International Workshop on Computer Science and Engineering-Information Processing and Control Engineering (WCSE 2015-IPCE), pp. 510-514, Moscow, Russia, April 15-17, 2015.