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arXiv 0705.1085cond-mat.mes-hallcond-mat.supr-con
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超导量子比特中的弛豫是相关的吗?

Is relaxation correlated in superconducting qubits?

T. Ojanen, A. O. Niskanen, Y. Nakamura, A. A. Abdumalikov

摘要:

我们考虑耦合量子双态系统(量子比特)暴露于一个全球性的弛豫过程。全局弛豫是指量子比特以近似相等的强度耦合到相同的量子浴的假设,适用于长波长的环境波动。我们表明,相互作用不破坏迪克的subradiant和superradiant状态的量子干涉效应导致显着偏离独立的弛豫图片的图片。值得注意的是,该系统具有稳定的纠缠态和比单量子比特激发更快的状态衰减。我们提出了一个方案,这些效果可以在超导磁通量子比特实验访问,并可能用于构建长寿命的纠缠态。

英文摘要:

We consider coupled quantum two-state systems (qubits) exposed to a global relaxation process. The global relaxation refers to the assumption that qubits are coupled to the same quantum bath with approximately equal strengths, appropriate for long-wavelength environmental fluctuations. We show that interactions do not spoil the picture of Dicke's subradiant and superradiant states where quantum interference effects lead to striking deviations from the independent relaxation picture. Remarkably, the system possess a stable entangled state and a state decaying faster than single qubit excitations. We propose a scheme how these effects can be experimentally accessed in superconducting flux qubits and, possibly, used in constructing long-lived entangled states.

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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