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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 33, Iss. 18 — Sep. 15, 2008
  • pp: 2119–2121

On the distinguishability of downconverted modes with orbital angular momentum

Geraldo Alexandre Barbosa  »View Author Affiliations

Optics Letters, Vol. 33, Issue 18, pp. 2119-2121 (2008)

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Assuming two quantum states of spontaneous parametric downconversion carrying orbital angular momentum, one may ask the question what is the minimum probability of error in identifying between two of these biphoton states by an arbitrary physical measurement over the biphoton state generated. While correctly chosen geometries may lead to perfect distinguishability of modes, it is worth noticing that experimental subtleties may lead to a poor mode distinguishability. We discuss the case where a restricted range instead of the needed range of wave vectors is collected by the experimental setup. These considerations may be useful for some applications, e.g., cryptography.

© 2008 Optical Society of America

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.0270) Quantum optics : Quantum optics
(060.4785) Fiber optics and optical communications : Optical security and encryption
(270.5568) Quantum optics : Quantum cryptography
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: June 2, 2008
Manuscript Accepted: July 7, 2008
Published: September 12, 2008

Geraldo Alexandre Barbosa, "On the distinguishability of downconverted modes with orbital angular momentum," Opt. Lett. 33, 2119-2121 (2008)

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