Protection of entanglement from disturbance of the environment is an essential task in quantum information processing. We study the dynamic behaviours of quantum entanglement between two uncoupled qubits, which are immersed in a common phase decoherence environment. We examine the validity of the local non-Hermitian operation in the amplification of qubit–qubit entanglement. In particular, using analytical and numerical investigations, we show explicitly that the quantum entanglement of the two qubits can be greatly amplified by means of non-Hermitian operation.

中文翻译：

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相位退相干源下非厄米运算放大量子纠缠

保护纠缠免受环境干扰是量子信息处理中的一项基本任务。我们研究了两个未耦合的量子位之间的量子纠缠的动态行为，这些量子位沉浸在一个共同的相位退相干环境中。我们检查了局部非厄米运算在放大量子比特-量子比特纠缠中的有效性。特别是，使用分析和数值研究，我们明确表明两个量子位的量子纠缠可以通过非厄米运算大大放大。