A practical two-way system of quantum key distribution with untrusted source

doi:10.1088/1674-1056/20/10/100305

Abstract The most severe problem of a two-way "plug-and-play" (p & p) quantum key distribution system is that the source can be controlled by the eavesdropper. This kind of source is defined as an üntrusted source". This paper discusses the effects of the fluctuation of internal transmittance on the final key generation rate and the transmission distance. The security of the standard BB84 protocol, one-decoy state protocol, and weak+vacuum decoy state protocol, with untrusted sources and the fluctuation of internal transmittance are studied. It is shown that the one-decoy state is sensitive to the statistical fluctuation but weak+vacuum decoy state is only slightly affected by the fluctuation. It is also shown that both the maximum secure transmission distance and final key generation rate are reduced when Alice's laboratory transmittance fluctuation is considered.

Keywords: statistic fluctuation untrusted source quantum key distribution

Received: 05 November 2010
Revised: 17 April 2011
Accepted manuscript online:

PACS:	03.67.Dd	(Quantum cryptography and communication security)
	03.67.Hk	(Quantum communication)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11074072).

Cite this article:

Chen Ming-Juan(陈明娟) and Liu Xiang(刘翔) A practical two-way system of quantum key distribution with untrusted source 2011 Chin. Phys. B 20 100305

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A practical two-way system of quantum key distribution with untrusted source

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