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Research in Optical Sciences

A modified ‘‘Plug and play’’ systems and a multi -user system for quantum cryptography

Haiqiang Ma, Jian-Hui Yang, Kejin Wei, Ruixue Li, Wu Zhu

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We propose a modified ‘‘Plug and play’’ systems, which skillfully makes use of automatic alignment of the photon polarization states in optical fiber and a multi-users quantum key distribution system based on the aforementioned systems.
DOI
10.1364/hilas.2014.jw2a.39

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Quantum cryptography has been shown to be an effective technology for the secure distribution of keys on point-to-point optical links. We show how the existing techniques can be extended to allow multi-user secure key distribution on optical networks. We demonstrate that using network configurations typical of those found in passive optical network architectures any of the current quantum key distribution protocols can be adapted to implement secure key distribution from any user to any other user. An important feature of these adapted protocols is that the broadcaster, or service provider on the network, does not have to be trusted by the two users who wish to establish a key.
We propose an auto-compensating differential phase shift scheme for quantum key distribution with a high key-creation efficiency, which skillfully makes use of automatic alignment of the photon polarization states in optical fiber with modified Michelson interferometers composed of unequal arms with Faraday mirrors at the ends. The Faraday-mirrors-based Michelson interferometers not only function as pulse splitters, but also enable inherent compensation of polarization mode dispersion in the optic-fiber paths at both Alice's and Bob's sites. The sequential pulses encoded by differential phase shifts pass through the quantum channel with the same polarization states, resulting in a stable key distribution immune to the polarization mode dispersion in the quantum channel. Such a system features perfect stability and higher key creation efficiency over traditional schemes.