Quantum key distribution at telecom wavelengths with noise-free detectors

Details Quantum key distribution at telecom wavelengths with noise-free detectors Quantum key distribution at telecom wavelengths with noise-free detectors

2005-10-09

arxiv.org/abs/quant-ph/0510062v1

Applied Physics Letters 88, 021108 (2006)

Physics

Quantum Physics

Scientific paper

10.1063/1.2164307

The length of a secure link over which a quantum key can be distributed depends on the efficiency and dark-count rate of the detectors used at the receiver. We report on the first demonstration of quantum key distribution using transition-edge sensors with high efficiency and negligible dark-count rates. Using two methods of synchronization, a bright optical pulse scheme and an electrical signal scheme, we have successfully distributed key material at 1,550 nm over 50 km of optical fiber. We discuss how use of these detectors in a quantum key distribution system can result in dramatic increases in range and performance.

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