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

Quantum key distribution over 122 km of standard telecom fiber