Qubits entanglement dynamics modified by an effective atomic environment

Abstract

We study entanglement dynamics of a couple of two-level atoms resonantly interacting with a cavity mode and embedded in a dispersive atomic environment. We show that in the absence of the environment the entanglement reaches its maximum value when only one exitation is involved. Then, we find that the atomic environment modifies that entanglement dynamics and induces a typical collapse-revival structure even for an initial one photon Fock state of the field.

eight pages, two figure included

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• Slicing the Fock space for state production and protection
• Using squeezed field to preserve two-atom entanglement against spontaneous emissions
• Asymptotic entanglement sudden death in two atoms with dipole-dipole and Ising interactions coupled to a radiation field at non-zero detuning
• Entanglement enhancement and postselection for two atoms interacting with thermal light
• Quantum phase transitions in an effective Hamiltonian: fast and slow systems