Dual-Gated Qkd System for Wdm Networks
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United States of America Patent
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Issued Date -
Nov 6, 2008
app pub date -
Sep 14, 2005
filing date -
Sep 15, 2004
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Abandoned
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Abstract
Systems and methods of incorporating a QKD system (Q) into a WDM network (2) are disclosed. The methods include electrically gating the single-photon detectors (SPDs) (30, 30') as well as optically gating the SPDs with optical gates (28, 28'). The electronic gating width (TSPD) and the optical gating width (TOG) are selected to significantly reduce noise from scattered photons. The combined optical and electronic gating of the SPDs provides for Fourier-transform-limited detection of the quantum signal (SQ) that is not otherwise possible in a WDM-QKD system that employs only electronic SPD gating.
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