Distributed entanglement induced by dissipative bosonic media

¹ Lab of Quantum Optics, Department of Physics, Fuzhou University - Fuzhou 350002, PRC
² Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences - Hefei 230026, PRC

^(a) sbzheng11@163.com

Received: 1 April 2012
Accepted: 21 June 2012

Abstract

We describe a scheme with analytic result that allows to generate steady-state entanglement for two atoms over a dissipative bosonic medium. The resonant coupling between the mediating bosonic mode and cavity modes produces three collective atomic decay channels. This dissipative dynamics, together with the unitary process induced by classical microwave fields, drives the two atoms to the symmetric or asymmetric entangled steady state conditional upon the choice of the phases of the microwave fields. The effects on the steady-state entanglement of off-resonance mediating bosonic modes are analyzed. The entanglement can be obtained with high fidelity regardless of the initial state and there is a linear relation in the scaling of the fidelity with the cooperativity parameter. The fidelity is insensitive to the fluctuation of the Rabi frequencies of the classical driving fields.