Quantum key distribution over 122 km of standard telecom fiber

Details Quantum key distribution over 122 km of standard telecom fiber Quantum key distribution over 122 km of standard telecom fiber

2004-12-22

arxiv.org/abs/quant-ph/0412171v1

Applied Physics Letters 84, 3762-3764(2004)

Physics

Quantum Physics

Scientific paper

10.1063/1.1738173

We report the first demonstration of quantum key distribution over a standard telecom fiber exceeding 100 km in length. Through careful optimisation of the interferometer and single photon detector, we achieve a quantum bit error ratio of 8.9% for a 122km link, allowing a secure shared key to be formed after error correction and privacy amplification. Key formation rates of up to 1.9 kbit/sec are achieved depending upon fiber length. We discuss the factors limiting the maximum fiber length in quantum cryptography.

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