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Optics Letters

Optics Letters


  • Editor: Anthony J. Campillo
  • Vol. 30, Iss. 23 — Dec. 1, 2005
  • pp: 3207–3209

Low-light-level photon switching by quantum interference

Yong-Fan Chen, Zen-Hsiang Tsai, Yu-Chen Liu, and Ite A. Yu  »View Author Affiliations

Optics Letters, Vol. 30, Issue 23, pp. 3207-3209 (2005)

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We report an experimental demonstration of low-light-level photon switching by quantum interference in laser-cooled Rb 87 atoms. A resonant probe pulse with an energy per unit area of one photon per λ 2 2 π propagates through the optically thick atoms. Its energy transmittance is greater than 63%, or a loss of less than e 1 , because of the effect of electromagnetically induced transparency. In the presence of a switching pulse with an energy per unit area of 1.4 photons per λ 2 2 π , the energy transmittance of the same probe pulse becomes less than 37%, or e 1 . This substantial reduction of probe transmittance caused by switching photons may lead to potential applications in single-photon-level nonlinear optics and manipulation of quantum information.

© 2005 Optical Society of America

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(190.0190) Nonlinear optics : Nonlinear optics
(270.1670) Quantum optics : Coherent optical effects

ToC Category:
Quantum Optics

Yong-Fan Chen, Zen-Hsiang Tsai, Yu-Chen Liu, and Ite A. Yu, "Low-light-level photon switching by quantum interference," Opt. Lett. 30, 3207-3209 (2005)

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