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Conference on Lasers and Electro-Optics

Design of Synchronous “Plug & Play” QKD-WDM-PON for Efficient Quantum Communications

Yi Zhao, Martin Roetteler, Lei Xu, Ting Wang

Published Jan 1, 2011• 2 citations
Publisher

Abstract

We propose a new design of quantum key distribution (QKD) – WDM-PON with “plug & play” scheme and synchronization. Simulations show that the design can improve the quantum key generation rate 3 - 4 times over conventional schemes.
DOI
10.1364/cleo_at.2011.jthb22

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Abstract Robust, simple, and flexible quantum key distribution (QKD) is vital for realizing practical applications of this technique. Contrary to typical phase-coded QKD schemes, the plug-and-play QKD design requires only one arm-length-insensitive interferometer without active feedback, in which the noise is automatically compensated by the two-way structure. However, there are certain possible loopholes in the typical plug-and-play designs, which require consideration and strict monitoring. This study proposes a new design of theoretically loophole-free plug-and-play QKD scheme with two-way protocol and presents an experimental demonstration of said scheme. The security is analyzed under a collective attack scenario assisted by the decoy state method. The scheme was implemented in a 50.4 km commercial fibre without active feedback. The system showed highly robust performance with an ultra-low error rate and maintained an ultra-high visibility of 0.9947 ± 0.0002 through significant environmental changes over 24 hours.