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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 4 — Apr. 1, 2013
  • pp: 782–787

Decoy-state method for subcarrier-multiplexed frequency-coded quantum key distribution

Sudeshna Bhattacharya and Pradeep Kumar Krishnamurthy  »View Author Affiliations


JOSA B, Vol. 30, Issue 4, pp. 782-787 (2013)
http://dx.doi.org/10.1364/JOSAB.30.000782


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Abstract

We propose a decoy-state method to increase key generation rate of frequency-coded (FC) implementation of B92 quantum key distribution (QKD) protocol. Direct application of decoy-state method to FC-QKD results in a security loophole. We overcome this loophole by optimizing the ratio of decoy-to-signal carrier photon number to unity. Simulation results for a single-channel FC-QKD show 16 kbits of raw key length at a transmission distance of 70 km. We then extend the decoy-state method to subcarrier-multiplexed FC-QKD. We show that key generation rate and secure link length improves by a factor of 5 and 40 km, respectively, compared to single-carrier with decoy-state method.

© 2013 Optical Society of America

OCIS Codes
(270.5565) Quantum optics : Quantum communications
(270.5568) Quantum optics : Quantum cryptography
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

History
Original Manuscript: July 16, 2012
Revised Manuscript: January 29, 2013
Manuscript Accepted: January 29, 2013
Published: March 6, 2013

Citation
Sudeshna Bhattacharya and Pradeep Kumar Krishnamurthy, "Decoy-state method for subcarrier-multiplexed frequency-coded quantum key distribution," J. Opt. Soc. Am. B 30, 782-787 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-4-782


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