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Enhancement of geometric discord for the system of superconducting qubits and transfer of quantum information

机译:超导量子位系统和量子信息传递的几何不和谐的增强

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摘要

We investigate how quantum measurements affect the dynamics of quantum correlations of the system which consists of two noninteracting superconducting qubits each locally coupling to its own data bus. It is shown that the geometric discord and entanglement between two superconducting qubits can be increased by applying a sequence of selective measurements. The optimal measurement time at which the quantum correlations achieve their maximal values is also analyzed. Moreover, we find that the selective measurements on the data buses can protect quantum information of two superconducting qubits and force information to flow back to the superconducting qubits from the data buses by a witness of the trace distance.
机译:我们研究了量子测量如何影响系统的量子相关动力学,该系统由两个互不干扰的超导量子位组成,每个量子位均本地耦合至其自身的数据总线。结果表明,通过应用一系列选择性测量,可以增加两个超导量子位之间的几何不一致和纠缠。还分析了量子相关性达到其最大值的最佳测量时间。此外,我们发现,对数据总线的选择性测量可以保护两个超导量子位的量子信息,并通过跟踪距离的见证来迫使信息从数据总线流回到超导量子位。

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