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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 32, Iss. 9 — May. 1, 2007
  • pp: 1165–1167

Differential-phase quantum key distribution experiment using a series of quantum entangled photon pairs

Toshimori Honjo, Hiroki Takesue, and Kyo Inoue  »View Author Affiliations

Optics Letters, Vol. 32, Issue 9, pp. 1165-1167 (2007)

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We report what we believe to be the first differential-phase quantum key distribution experiment using a series of quantum entangled photon pairs. We employed two outstanding techniques. As an entangled photon source, we used a 1.5 μ m band entangled photon pair source based on spontaneous four-wave mixing in a cooled dispersion-shifted fiber. As receivers, photon pairs were actively phase modulated with Li Nb O 3 phase modulators followed by very stable planar light-wave circuit Mach–Zehnder interferometers, which provided two nonorthogonal measurements. As a consequence, we successfully generated sifted keys with a quantum bit error rate of 8.3% and a key generation rate of 0.3   bit s and revealed the feasibility of this QKD scheme.

© 2007 Optical Society of America

OCIS Codes
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(270.0270) Quantum optics : Quantum optics

ToC Category:
Quantum Optics

Original Manuscript: November 30, 2006
Revised Manuscript: February 5, 2007
Manuscript Accepted: February 5, 2007
Published: April 3, 2007

Toshimori Honjo, Hiroki Takesue, and Kyo Inoue, "Differential-phase quantum key distribution experiment using a series of quantum entangled photon pairs," Opt. Lett. 32, 1165-1167 (2007)

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