Communications in Theoretical Physics ›› 2014, Vol. 62 ›› Issue (05): 655-662.

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Dynamic Quantum Erasure Mediated by Electromagnetically Induced Transparency

ZHU Hai-Long, LU Jing   

  1. Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081, China
  • Received: 2013-09-27 Revised: 2014-08-21 Published: 2014-11-01
  • Contact: LU Jing E-mail:lujing@hunan.edu.cn
  • Funding Information: 

    Supported by National Natural Science Foundation of China under Grant Nos. 11105050, and 11074071, National Basic Research Program of China under Grant No.2012CB922103, Program for Changjiang Scholars and Innovative Research Team in University under Grant No.IRT0964, the Research Fund for the Doctoral Program of Higher Education under Grant No.20104306120003, Hunan Provincial Natural Science Foundation of China under Grant Nos. 11JJ7001 and 12JJ1002, Scientific Research Fund of Hunan Provincial Education Department unde Grant No.11B076

Abstract: We propose a scheme on control of the transition from quantum decoherence to coherence of a considered system S provided by the polarization degree of freedom of a probe field coupled to its motional degrees of freedom representing the environment B. A magneto-optically manipulated atomic ensemble with a tripod configuration is used to enhance the coupling between systems S and B. The spatial profile of the external fields induces a spatially varying potential for system B in the gas cell with identical and noninteracting atoms at different transverse points. It is found that the coherence of the system S can be maintained, lost or gained by properly choosing the incident positions of the probe field with respect to the center of the control laser field, and the two photon detuning for each components of the probe laser field.

Key words: entanglement, decoherence factor, electromagnetically induced transparency

PACS numbers: 

  • 03.65.Ta