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arXiv 0801.2994cond-mat.supr-con
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超导量子线路中的变换耗散

Transformed Dissipation in Superconducting Quantum Circuits

Matthew Neeley, M. Ansmann, Radoslaw C. Bialczak, M. Hofheinz, N. Katz, Erik Lucero, A. O'Connell, H. Wang, A. N. Cleland, John M. Martinis

摘要:

超导量子线路必须仔细设计,以避免耦合到外部控制电路的耗散。在这里,我们引入电流转换的概念来量化与环境的耦合。我们测试这个理论与实验确定的$\sim 10^5$的阻抗变换,并找到定量协议比2的因素之间的这种变换和减少的相位量子位耦合到一个可调的Transformer的寿命。量子涨落的高阶修正也用这个理论计算,但发现不会限制量子比特的寿命。我们还说明了电流和阻抗变换之间的这种简单联系如何可以用来排除实验量子比特系统中的耗散源。

英文摘要:

Superconducting quantum circuits must be designed carefully to avoid dissipation from coupling to external control circuitry. Here we introduce the concept of current transformation to quantify coupling to the environment. We test this theory with an experimentally-determined impedance transformation of $\sim 10^5$ and find quantitative agreement better than a factor of 2 between this transformation and the reduced lifetime of a phase qubit coupled to a tunable transformer. Higher-order corrections from quantum fluctuations are also calculated with this theory, but found not to limit the qubit lifetime. We also illustrate how this simple connection between current and impedance transformation can be used to rule out dissipation sources in experimental qubit systems.

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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