Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 19, Pages 3762-3764Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1738173
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We report a demonstration of quantum key distribution over a standard telecom fiber exceeding 100 km in length. Through careful optimization of the interferometer and single photon detector, we achieve a quantum bit error ratio of 8.9% for a 122 km link, allowing a secure shared key to be formed after error correction and privacy amplification. Key formation rates of up to 1.9 kbit/s are achieved depending upon fiber length. We discuss the factors limiting the maximum fiber length in quantum cryptography. (C) 2004 American Institute of Physics.
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