LAUSR

We examine the validity of the environment-assisted measurement (EAM) in the restoration of quantum state and quantum entanglement in the non-zero temperature environment. Special attention is paid to the dependence of quantum fidelity and entanglement on the temperature T. In particular, by solving the master equation, we get the exact analytical or numerical simulations expressions of the optimal final restoration, showing explicitly that combining the EAM and quantum measurement reversal (QMR) operations does indeed help in recovering single-qubit quantum state and arbitrarily two-qubit quantum entanglement from finite temperature decoherence.