Resonance inversion in a superconducting cavity coupled to artificial atoms and a microwave background
Resonance inversion in a superconducting cavity coupled to artificial atoms and a microwave background
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DOI：
10.1103/physreva.99.063804
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发表时间：
2018-07
影响因子：
2.9
通讯作者：
J. Leppakangas;J. Brehm;P. Yang;Lingzhen Guo;M. Marthaler;A. Ustinov;M. Weides
中科院分区：
文献类型：
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作者：
J. Leppakangas;J. Brehm;P. Yang;Lingzhen Guo;M. Marthaler;A. Ustinov;M. Weides
我们演示了如何加热的环境可以反转的驱动腔的线形。我们考虑了超导共面腔与多个人造原子的耦合。所测量的腔传输的特征在于Fano型谐振的形状是连续可调的偏置电流通过附近的（磁通量）控制线。特别地，微波腔的相同色散偏移可以被观察为峰值或谷值。我们发现，这种Fano峰反转是可能的，由于通过具有反应性和耗散性的背景和通过受偏置电流诱导加热影响的腔体的微波传输之间的可调谐干扰。背景传输由于控制线和传输线之间的串扰而发生。我们展示了如何这样的背景可以占Jaynes-Cummings型模型通过修改腔和传输线之间的边界条件。我们发现，一般情况下，而共振的位置决定系统的能量水平，共振的形状给系统的波动和耗散的信息。
We demonstrate how heating of an environment can invert the line shape of a driven cavity. We consider a superconducting coplanar cavity coupled to multiple artificial atoms. The measured cavity transmission is characterized by Fano-type resonances with a shape that is continuously tunable by bias current through nearby (magnetic flux) control lines. In particular the same dispersive shift of the microwave cavity can be observed as a peak or a dip. We find that this Fano-peak inversion is possible due to a tunable interference between a microwave transmission through a background with reactive and dissipative properties and through the cavity affected by bias-current induced heating. The background transmission occurs due to crosstalk between the control and transmission lines. We show how such background can be accounted for by Jaynes-Cummings type models via modified boundary conditions between the cavity and transmission lines. We find generally that whereas resonance positions determine system energy levels resonance shapes give information on system fluctuations and dissipation.