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arXiv 1508.04736quant-ph
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混合多体量子-经典系统中的分布关联和信息流

Distributed correlations and information flows within a hybrid multipartite quantum-classical system

Bruno Leggio, Rosario Lo Franco, Diogo O. Soares-Pinto, Paweł Horodecki, Giuseppe Compagno

摘要:

理解经典环境中量子纠缠复活的非马尔可夫机制是量子信息理论的核心。尝试性的解释已经给出了作为控制设备的环境的作用或隐藏的纠缠的概念。我们从信息理论的角度来解决这个问题。为了这个目的,我们考虑一个范式的三方系统,已经在实验室中实现,由两个独立的量子比特和一个随机的经典场局部相互作用的一个量子比特单独。我们研究了两量子比特纠缠与整个系统的真正三重关联之间的动力学关系,发现纠缠的崩溃和恢复分别对应于整个三重关联的上升和下降。有趣的是,纠缠暗周期可以使非零三方相关的平台。然后,我们解释这种行为的信息流在系统的不同方面。除了展示整体相关性冻结的现象外,我们的结果还为混合量子-经典系统中纠缠恢复的起源提供了新的见解。

英文摘要:

Understanding the non-Markovian mechanisms underlying the revivals of quantum entanglement in the presence of classical environments is central in the theory of quantum information. Tentative interpretations have been given by either the role of the environment as a control device or the concept of hidden entanglement. We address this issue from an information-theoretic point of view. To this aim, we consider a paradigmatic tripartite system, already realized in the laboratory, made of two independent qubits and a random classical field locally interacting with one qubit alone. We study the dynamical relationship between the two-qubit entanglement and the genuine tripartite correlations of the overall system, finding that collapse and revivals of entanglement correspond, respectively, to raise and fall of the overall tripartite correlations. Interestingly, entanglement dark periods can enable plateaux of nonzero tripartite correlations. We then explain this behavior in terms of information flows among the different parties of the system. Besides showcasing the phenomenon of the freezing of overall correlations, our results provide new insights on the origin of retrieval of entanglement within a hybrid quantum-classical system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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