Effects of cavity-cavity interaction on the entanglement dynamics of a generalized double Jaynes-Cummings model

摘要

We consider a generalized double Jaynes-Cummings model consisting of twoisolated two-level atoms, each contained in a lossless cavity, with thecavities interacting with each other through a controlled photon hoppingmechanism. The temporal dynamics of entanglement between the two atoms, as theatom-cavity system evolves with time, is investigated for different values ofthe mediated cavity-cavity interaction. We analytically show that at low valuesof such an interaction, entanglement between the atoms evolves under theeffects of cavity perturbation and exhibits the well-known phenomenon ofentanglement sudden death. Interestingly, using moderately large values of theinteraction, a complete preclusion of sudden death of entanglement can beachieved, irrespective of its value in the initial two-atom state. Our results,thus allow us to design a model to sustain bipartite entanglement between twoatomic qubits under the adverse effect of cavity induced environmentalperturbation, by introducing a non-intrusive inter-cavity photon exchange thatcan be physically realized through cavity-QED setups in contemporaryexperiments. For completeness, we also compare the effects of inter-cavityinteraction on entanglement with the case of direct spin-exchange interactionbetween the two isolated atoms.