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arXiv 0706.2402cond-mat.mes-hall
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超导磁通量子比特系统中可实现的自旋模型和纠缠动力学

Realizable spin models and entanglement dynamics in superconducting flux qubit systems

Qian Qian Shi, Sam Young Cho, Bo Li, Mun Dae Kim

摘要:

研究了双超导磁通量子比特系统中可实现的自旋模型。结果表明,在双通量量子比特系统中,通过对系统参数的特定调整,可以实现自然界中无法找到的人工双自旋系统。对于人工双自旋系统,讨论了量子态的时间演化,以量化量子纠缠动力学。作为时间的函数的并发度和保真度显示,揭示了一个特征的纠缠动力学的人工自旋系统。研究发现,由于双量子比特翻转隧穿过程引起的交换相互作用,非纠缠输入态可以周期性地演化为最大纠缠输出态,而单量子比特翻转隧穿过程对人工自旋起着磁场的作用.

英文摘要:

Realizable spin models are investigated in a two superconducting flux qubit system. It is shown that a specific adjustment of system parameters in the two flux qubit system makes it possible to realize an artificial two-spin system that cannot be found naturally. For the artificial two-spin systems, time evolution of a prepared quantum state is discussed to quantify quantum entanglement dynamics. The concurrence and fidelity as a function of time are shown to reveal a characteristic entanglement dynamics of the artificial spin systems. It is found that the unentangled input state can evolute to be a maximally entangled output state periodically due to the exchange interactions induced by two-qubit flipping tunneling processes while single-qubit flipping tunneling processes plays a role of magnetic fields for the artificial spins.

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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