Extension of point-to-multi-point quantum key distribution systems

Abstract

Abstract:

The quantum key generation efficiency and the transmission distances of two kinds of point-to-multi-point quantum key distribution (QKD) system are discussed. How to select the devices’ parameters is considered detailedly when designing a multi-user QKD system. Decoy states techniques can enhance the security of point-to-multi-point QKD systems, for example, the transmission distance is extended two times and the quantum key generation efficiency is improved a factor of ten. Based on point-to-multi-point QKD systems, we proposed a protocol which can realize secret keys sharing between two arbitrary receivers.

Key words: quantum optics, user extension, quantum key distribution network, optical node

ZHAO Feng, WANG Shao-Hua, CHEN Li, LONG Guang-Li. Extension of point-to-multi-point quantum key distribution systems[J]. J4, 2009, 26(6): 675-680.

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