https://doi.org/10.1140/epjd/e2014-40783-5
Regular Article
Entanglement generation under feedback control in dispersive regime
1 Department of Physics, Harbin
Institute of Technology, Harbin
150001, P.R.
China
2 Department of Electronic Information
Engineering, Nanchang University, Nanchang
330031, P.R.
China
a
Present address: Department of Physics, Harbin Institute of
Technology, Harbin 150001, P.R. China
b
e-mail: stliu@hit.edu.cn
Received:
11
December
2013
Received in final form:
9
March
2014
Published online:
5
June
2014
The entanglement generation in a system of two atoms dispersively coupled to a damped cavity mode and driven by a classical field is investigated by using the quantum-jump-based feedback control. We demonstrate that the entanglement of the two atoms can be significantly enhanced and a steady state of antisymmetric Bell state can be obtained. We focus on the role of classical driving, and verify that the laser driving results in a global steady state which can be reached in the whole atomic subspace, but it can only be reached from some special initial states without laser driving. Therefore the system with classical driving is more robust against spontaneous emission and non-unit detection efficiency. Numerical results demonstrate that the maximal entanglement can be obtained for a wide range of parameters.
Key words: Quantum Optics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2014