Eur. Phys. J. D 57, 111-116 (2010)
https://doi.org/10.1140/epjd/e2009-00323-2

Collective excitation and photon entanglement in double- atomic ensemble

School of physics and optoelectronic technology, Dalian University of Technology, Dalian, 116024, P.R. China

Corresponding author: zhlhxn@dlut.edu.cn

Received: 13 August 2009
Revised: 20 October 2009
Published online: 5 January 2010

Abstract

We investigate a double-Λ atomic ensemble trapped in a cavity and deduce the five species of polaritons. By analysing the analytic expression, we show the exchange of the two mode fields as well as frequency conversion. By studying the entanglement between the two mode fields, we exhibit the role of the five species of polaritons in entanglement creation. We also show the influence of the field and atomic decay on entanglement.