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Quantum key distribution over 122 km of standard telecom fiber

Appl. Phys. Lett. 84, 3762 (2004); doi:10.1063/1.1738173

Published 29 April 2004

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C. Gobby, Z. L. Yuan, and A. J. Shields
Toshiba Research Europe Ltd., Cambridge Research Laboratory, 260 Cambridge Science Park, Milton Road, Cambridge, CB4 0WE, United Kingdom
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. ©2004 American Institute of Physics.
History: Received 25 August 2003; accepted 17 March 2004; published 29 April 2004
Permalink: http://link.aip.org/link/?APPLAB/84/3762/1
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KEYWORDS and PACS

Keywords
PACS
  • 84.40.Ua
    Telecommunications: signal transmission and processing; communication satellites
  • 42.81.-i
    Fiber optics
  • 03.67.Dd
    Quantum cryptography
  • 03.67.Pp
    Quantum error correction and other methods for protection against decoherence
  • YEAR: 2004

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ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (17)
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