Entanglement generation under feedback control in dispersive regime

Abstract

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.