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Applied Physics Letters / Volume 96 / Issue 16 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 96, 161102 (2010); doi:10.1063/1.3385293 (3 pages)

Continuous operation of high bit rate quantum key distribution

A. R. Dixon, Z. L. Yuan, J. F. Dynes, A. W. Sharpe, and A. J. Shields

Cambridge Research Laboratory, Toshiba Research Europe Ltd., 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, United Kingdom

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(Received 26 February 2010; accepted 17 March 2010; published online 19 April 2010)

We demonstrate a quantum key distribution with a secure bit rate exceeding 1 Mbit/s over 50 km fiber averaged over a continuous 36 h period. Continuous operation of high bit rates is achieved using feedback systems to control path length difference and polarization in the interferometer and the timing of the detection windows. High bit rates and continuous operation allows finite key size effects to be strongly reduced, achieving a key extraction efficiency of 96% compared to keys of infinite lengths.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

error statistics, Mach-Zehnder interferometers, optical communication equipment, optical feedback, optical fibre polarisation, quantum cryptography, quantum optics, size effect

PACS

  • 03.67.Dd

    Quantum cryptography and communication security

  • 07.60.Ly

    Interferometers

  • 42.81.Gs

    Birefringence, polarization

  • 42.50.-p

    Quantum optics

  • 42.79.Sz

    Optical communication systems, multiplexers, and demultiplexers

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.3385293

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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