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Experimental demonstration of an active phase randomization and monitor module for quantum key distribution

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2 Author(s)
Sun, Shi-Hai ; Department of Physics, National University of Defense Technology, Changsha 410073, People’s Republic of China ; Liang, Lin-Mei

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Phase randomization is a very important assumption in the BB84 quantum key distribution (QKD) system with weak coherent source; otherwise, eavesdropper may spy the final key. In this Letter, a stable and monitored active phase randomization scheme for the one-way and two-way QKD system is proposed and demonstrated in experiments. Furthermore, our scheme gives an easy way for Alice to monitor the degree of randomization in experiments. Therefore, we expect our scheme to become a standard part in future QKD systems due to its secure significance and feasibility.

Published in:

Applied Physics Letters  (Volume:101 ,  Issue: 7 )

Date of Publication:

Aug 2012

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