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Photon-pressure strong coupling between two superconducting circuits
Nature Physics ( IF 19.6 ) Pub Date : 2020-08-10 , DOI: 10.1038/s41567-020-0987-5
D. Bothner , I. C. Rodrigues , G. A. Steele

The radiation-pressure coupling between two harmonic oscillators has been used in optomechanics for breakthrough experiments in the control and detection of mechanical displacement. Used primarily in optomechanics, there have been few reports of exploiting such a type of interaction in other platforms. Here, we engineer two superconducting LC circuits coupled by a strong photon-pressure interaction, a term we use in analogy to the radiation-pressure interaction between light and mechanical objects. The coupling arises from a change in the resonant frequency of one circuit in response to the current flowing in the second. We observe dynamical backaction between the two circuits, photon-pressure-induced transparency and absorption, and enter the strong coupling regime. Furthermore, we observe parametrically amplified thermal current fluctuations in a radiofrequency circuit close to its quantum ground state. Owing to the high design flexibility of superconducting circuits, our approach will enable new experiments with radiofrequency photons and parameter regimes of photon-pressure coupling that are not accessible in other platforms.



中文翻译:

两个超导电路之间的光子压力强耦合

两个谐波振荡器之间的辐射压力耦合已用于光力学中,用于控制和检测机械位移方面的突破性实验。主要用于光力学中,几乎没有关于在其他平台中利用这种类型的交互的报道。在这里,我们设计了两个通过强光子-压力相互作用耦合的超导LC电路,该术语类似于光与机械对象之间的辐射-压力相互作用。耦合是由于一个电路的谐振频率响应于第二个电路中流动的电流而产生的。我们观察到两个电路之间的动态反向作用,即光子压力引起的透明性和吸收性,并进入强耦合状态。此外,我们观察到射频电路中接近其量子基态的参数放大了的热电流波动。由于超导电路的高设计灵活性,我们的方法将使射频光子和光子压力耦合参数机制的新实验能够在其他平台上实现。

更新日期:2020-08-10
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