Possibility of inhomogeneous coupling leading to decoherence in an electromagnetically-induced-transparency quantum-memory process

Xiong-Jun Liu, Zheng-Xin Liu, Xin Liu, and Mo-Lin Ge
Phys. Rev. A 73, 013825 – Published 30 January 2006

Abstract

We study the effect of inhomogeneous coupling between atoms and external light fields on quantum memories that employ electromagnetically induced transparency (EIT). By introducing atomic subensembles to describe the present inhomogeneous coupling case we find that there is a nonsymmetric dark-state subspace that allows the EIT quantum-memory technique to function perfectly. This shows that such a memory scheme can work ideally even if the atomic state is very far from being a symmetric one.

  • Received 12 April 2005

DOI:https://doi.org/10.1103/PhysRevA.73.013825

©2006 American Physical Society

Authors & Affiliations

Xiong-Jun Liu1,2,*, Zheng-Xin Liu2,3, Xin Liu2,3, and Mo-Lin Ge2,3

  • 1Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
  • 2Theoretical Physics Division, Nankai Institute of Mathematics, Nankai University, Tianjin 300071, China
  • 3Liuhui Center for Applied Mathematics, Nankai University and Tianjin University, Tianjin 300071, China

  • *Electronic address: phylx@nus.edu.sg

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Vol. 73, Iss. 1 — January 2006

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