The enhancement of qubit–qubit entanglement is systematically investigated by employing local non-Hermitian operations. Special attention is paid to the comparison of prior and post non-Hermitian cases. We derive the exact expressions of concurrence quantifying entanglement to arrive at an exact solution model, consisting of two qubits interacting with an independent structured reservoir. The results show that qubit–qubit entanglement can obviously be enhanced by means of either local prior or post non-Hermitian operations. In particular, we find that the effect of the prior non-Hermitian operator process of the double damping channels is superior to the post non-Hermitian process, while the effect of the single damping channel case shows the opposite trend.

中文翻译：

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非马尔可夫环境中非厄密算子对纠缠的影响

通过采用局部非Hermitian运算系统地研究了qubit-qubit纠缠的增强。要特别注意比较之前和之后的非赫密特病例。我们得出并发量化纠缠的精确表达式，以得出一个精确的求解模型，该模型由两个qubit与一个独立的结构化油藏相互作用组成。结果表明，可以通过局部非Hermitian运算或之后的运算明显增强qubit-qubit纠缠。特别是，我们发现双重阻尼通道的先验非Hermitian算子过程的效果要优于后非Hermitian算子过程，而单阻尼通道情况的效应却显示出相反的趋势。