Transition linewidth of cross correlations in random intensity fluctuations in electromagnetically induced transparency

Lei Feng, Pengxiong Li, Mengzhen Zhang, Tun Wang, and Yanhong Xiao

Phys. Rev. A 89, 013815 – Published 14 January 2014

Abstract

It is known that cross correlation between the random intensity fluctuations of two lasers forming electromagnetically induced transparency (EIT) exhibits a transition from correlation to anticorrelation. We study the linewidth behavior of this transition and have found the linewidth is below the (effective) coherence lifetime limit and is limited only by competing noises. We established a numerical model which reveals the linewidth dependence on laser linewidth and laser power. Our experiments using lasers with different linewidth showed results in qualitative agreement with the model. This result is useful for quantum optics using EIT and may also have applications in spectroscopy and precision measurements.

Received 25 February 2013

DOI:https://doi.org/10.1103/PhysRevA.89.013815

Authors & Affiliations

Lei Feng¹, Pengxiong Li¹, Mengzhen Zhang¹, Tun Wang^2,3, and Yanhong Xiao^1,*

¹Department of Physics, State Key Laboratory of Surface Physics, Laboratory of Advanced Materials and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China
²Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
³Institute of Care-life, Chengdu 610041, China

^*yxiao@fudan.edu.cn

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Vol. 89, Iss. 1 — January 2014

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