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Symmetry in the open-system dynamics of quantum correlations

机译:量子相关性在开放系统动力学中的对称性

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摘要

We study the symmetry properties in the dynamics of quantum correlations for two-qubit systems in one-sided noisy channels, with respect to a switch in the location of noise from one qubit to the other. We consider four different channel types, namely depolarizing, amplitude damping, bit-flip, and bit-phase-flip channel, and identify the classes of initial states leading to symmetric decay of entanglement, non-locality and discord. Our results show that the symmetric decay of quantum correlations is not directly linked to the presence or absence of symmetry in the initial state, while it does depend on the type of correlation considered as well as on the type of noise. We prove that asymmetric decay can be used to infer, in certain cases, characteristic properties of the channel. We also show that the location of noise may lead to dramatic changes in the persistence of phenomena such as entanglement sudden death and time-invariant discord.
机译:我们研究了单噪声通道中两个量子位系统在量子相关动力学中的对称性,这涉及到噪声位置从一个量子位到另一个量子位的转换。我们考虑了四种不同的通道类型,即去极化,幅度阻尼,位翻转和位相翻转通道,并确定了导致纠缠,非局部和不对称对称衰减的初始状态的类别。我们的结果表明,量子相关性的对称衰减与初始状态中对称性的存在与否没有直接关系,而它确实取决于所考虑的相关性类型以及噪声的类型。我们证明,在某些情况下,可以使用非对称衰减来推断通道的特性。我们还表明,噪声的位置可能会导致诸如纠缠,猝死和时变不和谐之类的现象的持久性发生巨大变化。

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