No-switching quantum key distribution using broadband modulated coherent light

Lance, Andrew M., Symul, Thomas, Sharma, Vikram, Weedbrook, Christian, Ralph, Timothy C. and Lam, Ping Koy (2005) No-switching quantum key distribution using broadband modulated coherent light. Physical Review Letters, 95 18: 180503-1-180503-4. doi:10.1103/PhysRevLett.95.180503

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Author Lance, Andrew M.
Symul, Thomas
Sharma, Vikram
Weedbrook, Christian
Ralph, Timothy C.
Lam, Ping Koy
Title No-switching quantum key distribution using broadband modulated coherent light
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
Publication date 2005
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.95.180503
Open Access Status File (Publisher version)
Volume 95
Issue 18
Start page 180503-1
End page 180503-4
Total pages 4
Editor George Basbas
Jack Sandweiss
Reinhardt B. Schuhmann
Stanley G. Brown
Place of publication United States
Publisher American Physical Society
Collection year 2005
Language eng
Subject C1
249999 Physical Sciences not elsewhere classified
780102 Physical sciences
Abstract We realize an end-to-end no-switching quantum key distribution protocol using continuous-wave coherent light. We encode weak broadband Gaussian modulations onto the amplitude and phase quadratures of light beams. Our no-switching protocol achieves high secret key rate via a post-selection protocol that utilizes both quadrature information simultaneously. We establish a secret key rate of 25 Mbits/s for a lossless channel and 1 kbit/s for 90% channel loss, per 17 MHz of detected bandwidth, assuming individual Gaussian eavesdropping attacks. Since our scheme is truly broadband, it can potentially deliver orders of magnitude higher key rates by extending the encoding bandwidth with higher-end telecommunication technology.
Keyword Physics, Multidisciplinary
Privacy Amplification
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 05:48:01 EST