Two-way QKD system with active compensation
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United States of America Patent
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Oct 20, 2009
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N/A
app pub date -
Jun 25, 2004
filing date -
Dec 22, 2003
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Expired
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Abstract
A two-way actively stabilized QKD system that utilizes control signals and quantum signals is disclosed. Because the quantum signals do not traverse the same optical path through the system, signal collisions in the phase modulator are avoided. This allows the system to have a higher transmission rate than a two-way system in which the quantum signals traverse the same optical path. Also, the active stabilization process, which is based on maintaining a fixed relationship between an intensity ratio of interfered control signals, is greatly simplified by having the interferometer loops located all in one QKD station.
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