Eur. Phys. J. D (2016) 70: 89
https://doi.org/10.1140/epjd/e2016-60622-y

Regular Article

Entanglement transfer from two-mode anti-correlated continuous-variable systems to a pair of localized discrete systems

Department of Physics, Fuzhou University, Fuzhou 350116, P.R. China

^a e-mail: zbyang@fzu.edu.cn

Received: 2 November 2015
Received in final form: 7 February 2016
Published online: 19 April 2016

Abstract

We address the entanglement transfer from a bipartite continuous-variable(CV) system to a pair of localized discrete systems. The dynamics behavior can be implemented by two two-level atoms flying through spatially separated identical cavities where two quantized modes are injected. We assume each CV mode couples to one atom via the resonant Jaynes-Cummings interaction. The CV systems are initially prepared in a two-mode anti-correlated SU(2) coherent state, while with the initial atomic states of the cases: |g⟩₁|g⟩₂, |e⟩₁|e⟩₂ and |g⟩₁|e⟩₂, respectively. We find that the entanglement transfer for single-photon excitation case is more efficient than that for multi-photon excitation case. Under same conditions, we also note that the entanglement transfer is more efficient for SU(2) coherent state than for twin-bean (TWB) and pair-coherent (TMC) state. Besides, we show that, for a given total photon number of the initial SU(2) coherent state, the efficiency of entanglement transfer depends upon the distribution of photons in the two CV modes. We also consider the influences of the dissipation and the white noise on the entanglement transfer.