标题： 非马尔可夫噪声对多体量子态中纠缠维持的限制 显示英文标题

标题： Non-Markovian noise limits for sustaining entanglement in multiparty quantum states

摘要： 在多个量子信息处理任务中，主要资源是纠缠。 构建这些任务的实际有用版本时，通常需要考虑多体系统。 在这样的情况下，在分发资源时无法消除环境的影响。 我们展示了由于系统动力学中的非马尔可夫性导致的环境信息回流如何影响多体系统中的资源，特别是多用户纠缠。 特别是，我们发现多量子比特Greenberger-Horne-Zeilinger猫态的纠缠随着时间趋于一个非零值，对于非马尔可夫相位退相干噪声而言如此。 多量子比特W态趋于更高的值。 如果通道中的非马尔可夫性被移除，这些非零的时间饱和值会被消除。 多量子比特W态提供了更丰富的特征，包括对于渐近数量的量子比特的非零值以及与量子比特数量的奇偶二分法。 转向非马尔可夫去极化信道，我们发现猫态和W态在坍缩后表现出纠缠的复兴。 显示英文摘要

摘要： The principal resource in several quantum information processing tasks is entanglement. Building practically useful versions of such tasks, one often needs to consider multipartite systems. And in such scenarios, it is impossible to eliminate the effects of environment while distributing the resources. We show how information back-flow from the environment, as a result of non-Markovianity in the system dynamics, affects the resources in multipartite systems, specifically multiparty entanglement. In particular, we find that entanglement of multi-qubit Greenberger-Horne-Zeilinger cat states saturate with time to a non-zero value for a non-Markovian dephasing noise. The multi-qubit W states saturate to a higher value. Such non-zero time-saturated values are washed out if the non-Markovianity in the channel is removed. The multi-qubit W states provide a richer set of features, including a non-zero value for an asymptotic number of qubits and an even-odd dichotomy in entanglement with number of qubits. Moving over to a non-Markovian depolarising channel, we find that both cat and W states exhibit revival of entanglement after collapse.