Controllable double electromagnetically induced transparency in a closed four-level-loop cavity–atom system

doi:10.1088/1674-1056/26/7/074207

Abstract We present a theoretical study of an optical cavity coupled with single four-level atoms in closed loop formed via applied control lasers.The transmitted probe field from the cavity is analyzed.We show that the electromagnetically induced transparency (EIT) in the cavity and the normal mode splitting will be very different with changing the closed interaction phase and the intensity of the free-space control laser.This coupled cavity–atom system presents a variational double-EIT that comes from modulating the splitting of the dark state,which means that we could realize the gradual transfer between one EIT peak and two EIT peaks by adjusting the applied control lasers,and the normal mode splitting sidebands will shift slightly by changing the free-space control laser.This means that we could control the output cavity probe field more freely and it is easer to realize optical switch controlled by more parameters.We also depict the angular dispersion of the intracavity probe field in different free-space control laser.The large phase shift (–π→π) of the reflected intracavity probe field will be very useful for optical temporal differentiation and quantum phase gate.

Keywords: cavity quantum electrodynamics double electromagnetically induced transparency all optical switch cross phase modulation

Received: 14 February 2017
Revised: 23 March 2017
Accepted manuscript online:

PACS:	42.50.Pq	(Cavity quantum electrodynamics; micromasers)
	42.50.-p	(Quantum optics)
	42.65.Pc	(Optical bistability, multistability, and switching, including local field effects)
	42.65.-k	(Nonlinear optics)

Fund: Project supported by the National Natural Science Foundation of China (Grant No.11174109).

Corresponding Authors: Xue-Mei Su
E-mail: suxm@jlu.edu.cn

Cite this article:

Miao-Di Guo(郭苗迪), Xue-Mei Su(苏雪梅) Controllable double electromagnetically induced transparency in a closed four-level-loop cavity–atom system 2017 Chin. Phys. B 26 074207

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Controllable double electromagnetically induced transparency in a closed four-level-loop cavity–atom system

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