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The entanglement of pair cat states in the phase damping channel is studied by employing the relative entropy of entanglement. It is shown that the pair cat states can always be distillable in the phase damping channel. Furthermore, we analyze the fidelity of teleportation for the pair cat states by using joint measurements of the photon-number sum and phase difference.
We investigate the stationary state entanglement in the interacting system of a single mode thermal field and a single qubit with phase decoherence. The influence of initial temperature of thermal field, initial mixedness of the qubit and detuning on the stationary state entanglement is then examined.
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