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Proceedings Paper

A complete quantum cryptographic system using a continuous wave laser
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Paper Abstract

We experimentally demonstrate a complete, end-to-end, quantum key distribution system using a continuous wave laser and standard optical components. Our implementation encodes random bits as weak Gaussian modulations onto the phase and amplitude quadratures of the laser beam. We process data from the quantum channel using a post-selection procedure and subsequently apply information reconciliation and privacy amplification procedures to generate an absolutely secure secret key. The maximum information that an eavesdropper may have obtained about this secret key, from the quantum channel and classical communications, is bounded to below one bit. Under the assumption of individual Gaussian eavesdropping attacks, we achieve a secret key generation rate of 25 Mbits/s for a lossless channel and 1 kbit/s for 90% channel loss, per 17 MHz of detected bandwidth.

Paper Details

Date Published: 16 January 2006
PDF: 10 pages
Proc. SPIE 6038, Photonics: Design, Technology, and Packaging II, 603803 (16 January 2006); doi: 10.1117/12.651721
Show Author Affiliations
Vikram Sharma, Australian National Univ. (Australia)
Andrew M. Lance, Australian National Univ. (Australia)
Thomas Symul, Australian National Univ. (Australia)
Christian Weedbrook, Univ. of Queensland (Australia)
Timothy C. Ralph, Univ. of Queensland (Australia)
Ping Koy Lam, Australian National Univ. (Australia)

Published in SPIE Proceedings Vol. 6038:
Photonics: Design, Technology, and Packaging II
Derek Abbott; Yuri S. Kivshar; Halina H. Rubinsztein-Dunlop; Shanhui Fan, Editor(s)

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