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.

中文翻译：

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使用环境辅助测量从有限温度的退相干恢复量子态

我们检查了环境辅助测量 (EAM) 在非零温度环境中恢复量子态和量子纠缠的有效性。特别注意量子保真度和纠缠对温度 T 的依赖性。 特别是，通过求解主方程，我们得到了最佳最终恢复的精确解析或数值模拟表达式，明确表明将 EAM 和量子测量相结合反转 (QMR) 操作确实有助于从有限温度退相干恢复单量子位量子态和任意两量子位量子纠缠。