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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 4 — Feb. 14, 2011
  • pp: 3004–3018

Long-distance practical quantum key distribution by entanglement swapping

Artur Scherer, Barry C. Sanders, and Wolfgang Tittel  »View Author Affiliations

Optics Express, Vol. 19, Issue 4, pp. 3004-3018 (2011)

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We develop a model for practical, entanglement-based long-distance quantum key distribution employing entanglement swapping as a key building block. Relying only on existing off-the-shelf technology, we show how to optimize resources so as to maximize secret key distribution rates. The tools comprise lossy transmission links, such as telecom optical fibers or free space, parametric down-conversion sources of entangled photon pairs, and threshold detectors that are inefficient and have dark counts. Our analysis provides the optimal trade-off between detector efficiency and dark counts, which are usually competing, as well as the optimal source brightness that maximizes the secret key rate for specified distances (i.e. loss) between sender and receiver.

© 2011 Optical Society of America

OCIS Codes
(270.5565) Quantum optics : Quantum communications
(270.5568) Quantum optics : Quantum cryptography

ToC Category:
Quantum Optics

Original Manuscript: January 4, 2011
Revised Manuscript: January 26, 2011
Manuscript Accepted: January 26, 2011
Published: February 1, 2011

Artur Scherer, Barry C. Sanders, and Wolfgang Tittel, "Long-distance practical quantum key distribution by entanglement swapping," Opt. Express 19, 3004-3018 (2011)

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