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Journal of Physics B Atomic Molecular and Optical Physics

Spontaneously generated coherence in a Rb atom via photon counting statistics

Zhuo Song, Yonggang Peng, Zhendong Sun, Yujun Zheng

Published Nov 24, 2015• 5 citations
Publisher

Abstract

Abstract We study the spontaneously generated coherence (SGC) in a Rb atom by employing photon counting statistics based on the four-level Y -type model driven by a probe field and two coherent control fields. A transparency channel induced by coherent population trapping (CPT) and ultra-narrow probe absorption peaks in the presence of SGC are found.

DOI
10.1088/0953-4075/49/1/015001

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Abstract We study the spontaneously generated coherence (SGC) in a Rb atom by employing photon counting statistics based on the four-level Y -type model driven by a probe field and two coherent control fields. A transparency channel induced by coherent population trapping (CPT) and ultra-narrow probe absorption peaks in the presence of SGC are found.
This paper investigates the effects of spontaneously generated coherence(SGC) on the probe absorption in the Y-type four-level atomic system driven by three fields.It finds that the probe absorption at the resonance center shows the different phenomena with the SGC effects.When SGC produces the destructive interference on the probe absorption,the absorption at the resonance center is reduced with the SGC enhancement and the gain appears there.When SGC produces the constructive interference on the probe absorption,the absorption at the resonance center is enhanced with the SGC enhancement.That is electromagnetically induced absorption(being abbreviated EIA);the intensity of double electromagnetically induced transparency(being abbreviated EIT);at both sides of the resonance is increased,and the windows get wider.At the same time,the linewidth of the absorption at the resonance center becomes narrow and the transparent windows at both sides of the resonance get wider when the spontaneous decay rate of energy levels |3〉→|2〉 and 4〉→|2〉 is decreased at the ratio of the spontaneous decay rate of energy levels |3〉→|2〉 and |4〉→|2〉 being constant.
In this work, the effects of quantum interference and spontaneously generated coherence (SGC) are theoretically analyzed in a four-level system of a 87Rb^{87}\mathrm{Rb}87Rb atom. For the effects of SGC, we find that a new kind of electromagnetically induced transparency channel can be induced due to destructive interference, and the nonlinear Kerr absorption can be coherently narrowed or eliminated under different strengths of the coupling and switching fields.
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