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Title: Narrowband biphoton generation near atomic resonance
Authors: Du, Shengwang
Wen, Jianming
Rubin, Morton H.
Keywords: Nonlinear optics
Four-wave mixing
Parametric processes
Quantum optics
Issue Date: 1-Dec-2008
Citation: Journal of the Optical Society of America B, v. 25, iss. 12, p. C98-C108, 1 December 2008
Abstract: Generating nonclassical light offers a benchmark tool for the fundamental research and potential applications in quantum optics. Conventionally, it has become a standard technique to produce the nonclassical light through the nonlinear optical processes occurring in nonlinear crystals. In this review we describe using cold atomic-gas media to generate such nonclassical light, especially focusing on narrow-band biphoton generation. Compared with the standard procedure, the new biphoton source has such properties as long coherence time, long coherence length, high spectral brightness, and high conversion efficency. Although there exist two methodologies describing the physical process, in this paper we concentrate on the theoretical aspect of the entangled two-photon state produced from the four-wave mixing in a multilevel atomic ensemble using perturbation theory. We show that both linear and nonlinear optical responses to the generated fields play an important role in deter! mining the biphoton waveform and, consequently on the two-photon temporal correlation. There are two characteristic regimes determined by whether the linear or nonlinear coherence time is dominant. In addition, our model provides a clear physical picture that brings insight into understanding biphoton optics with this new source. We apply our model to recent work on generating narrow-band (and even subnatural linewidth) paired photons using the technique of electromagnetically induced transparency and slow-light effect in cold atoms, and find good agreements with experimental results.
Rights: We would like to give credit to the Optical Society of America for granting us permission to repost this Optics Infobase article. The original article is posted on the journal's web site at
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