Decoherence of two-qubit system in a non-Markovian squeezed reservoir

The decoherence of two initially entangled qubits coupled with asqueezed vacuum cavity separately is investigated exactly. Theresults show that, first, in principle, the disentanglement timedecreases with the increase of squeeze parameter r, due to theaugmenting of average photon number of every mode in the squeezedvacuum cavity. Second, there appear entanglement revivals after thecomplete disentanglement for the case of even parity initial Bellstate, while there occur the entanglement decrease and theentanglement revival before the complete disentanglement for thecase of odd parity initial Bell state. The results are quitedifferent from those for the case of qubits in a vacuum cavity.