High Speed Quantum Key Distribution System

Akio TAJIMA  Akihiro TANAKA  Seigo TAKAHASHI  Ken-ichiro YOSHINO  Yoshihiro NAMBU  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E93-A   No.5   pp.889-896
Publication Date: 2010/05/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E93.A.889
Print ISSN: 0916-8508
Type of Manuscript: INVITED PAPER (Special Section on Leading-Edge Developments in Quantum Cryptographic Systems)
quantum key distribution,  planar lightwave circuit,  single photon detector,  WDM,  

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Quantum key distribution (QKD) systems can generate unconditionally secure common keys between remote users. Improvements of QKD performance, particularly in key generation rate, have been required to meet current network traffic. A high-speed QKD system should be equipped with low-loss receivers with high visibility, highly efficient photon detectors with small dark count probability. A solution to these issues is to employ planar lightwave circuit (PLC) interferometers, single photon detection circuits and modules, together with multi-wavelength channels transmission using wavelength division multiplexing (WDM) technique.