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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 22, Iss. 5 — May. 1, 2005
  • pp: 1003–1006

Quantum cryptography with perfect multiphoton entanglement

Yuhui Luo and Kam Tai Chan  »View Author Affiliations

JOSA A, Vol. 22, Issue 5, pp. 1003-1006 (2005)

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Multiphoton entanglement in the same polarization has been shown theoretically to be obtainable by type-I spontaneous parametric downconversion (SPDC), which can generate bright pulses more easily than type-II SPDC. A new quantum cryptographic protocol utilizing polarization pairs with the detected type-I entangled multiphotons is proposed as quantum key distribution. We calculate the information capacity versus photon number corresponding to polarization after considering the transmission loss inside the optical fiber, the detector efficiency, and intercept–resend attacks at the level of channel error. The result compares favorably with all other schemes employing entanglement.

© 2005 Optical Society of America

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.4180) Quantum optics : Multiphoton processes

Original Manuscript: June 14, 2004
Revised Manuscript: August 17, 2004
Manuscript Accepted: December 3, 2004
Published: May 1, 2005

Yuhui Luo and Kam Tai Chan, "Quantum cryptography with perfect multiphoton entanglement," J. Opt. Soc. Am. A 22, 1003-1006 (2005)

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