标题： 一个贝尔对在一般的随机矩阵环境中 显示英文标题

标题： A Bell pair in a generic random matrix environment

摘要： 两个非相互作用的量子比特耦合到一个环境。 耦合和环境均由随机矩阵系综表示。 这对量子比特的初始状态是一个贝尔态，尽管我们还考虑了任意纯态。 通过纯度对这对量子比特的退相干进行了分析评估；蒙特卡洛计算证实了这些结果，并且还得到了这对量子比特的纠缠度。 这对量子比特内部的纠缠加速了退相干。 数值结果显示了已知于维尔纳态的纠缠度与纯度之间的关系，使我们能够给出纠缠度衰减的公式。 显示英文摘要

摘要： Two non-interacting qubits are coupled to an environment. Both coupling and environment are represented by random matrix ensembles. The initial state of the pair is a Bell state, though we also consider arbitrary pure states. Decoherence of the pair is evaluated analytically in terms of purity; Monte Carlo calculations confirm these results and also yield the concurrence of the pair. Entanglement within the pair accelerates decoherence. Numerics display the relation between concurrence and purity known for Werner states, allowing us to give a formula for concurrence decay.