16 January 2006 A complete quantum cryptographic system using a continuous wave laser
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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.
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Vikram Sharma, Andrew M. Lance, Thomas Symul, Christian Weedbrook, Timothy C. Ralph, and Ping Koy Lam "A complete quantum cryptographic system using a continuous wave laser", Proc. SPIE 6038, Photonics: Design, Technology, and Packaging II, 603803 (16 January 2006); doi: 10.1117/12.651721; https://doi.org/10.1117/12.651721

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