Dynamical Casimir effect in superconducting microwave circuits
Dynamical Casimir effect in superconducting microwave circuits
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DOI：
10.1103/physreva.82.052509
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发表时间：
2010-07
影响因子：
2.9
通讯作者：
J. Johansson;G. Johansson;C. Wilson;F. Nori
中科院分区：
文献类型：
--
作者：
J. Johansson;G. Johansson;C. Wilson;F. Nori
本文从理论上研究了基于可调边界条件的超导微加工波导电路中的动态Casimir效应。我们建议实施一个快速调制的边界条件，通过调整所施加的磁通量，通过超导量子干涉装置，嵌入在波导电路。我们考虑两个电路：（i）对应于自由空间中的单个反射镜的开放波导电路，以及（ii）耦合到微加工波导的谐振器，其对应于自由空间中的单侧腔。通过计算产生的光子通量密度、输出场相关函数和正交压缩谱，我们分析了这两种情况下的DCE的性质。我们表明，这些属性的输出场表现出独特的签名的辐射由于DCE，因此，可以用于区分DCE从其他类型的辐射在这些电路。我们还讨论了DCE之间的相似性和差异，在谐振腔的设置，和泵浦光子在参量振荡器的下转换。
We theoretically investigate the dynamical Casimir effect (DCE) in electrical circuits based on superconducting microfabricated waveguides with tunable boundary conditions. We propose implementing a rapid modulation of the boundary conditions by tuning the applied magnetic flux through superconducting quantum-interference devices that are embedded in the waveguide circuits. We consider two circuits: (i) An open waveguide circuit that corresponds to a single mirror in free space, and (ii) a resonator coupled to a microfabricated waveguide, which corresponds to a single-sided cavity in free space. We analyze the properties of the DCE in these two setups by calculating the generated photon-flux densities, output-field correlation functions, and the quadrature squeezing spectra. We show that these properties of the output field exhibit signatures unique to the radiation due to the DCE, and could, therefore, be used for distinguishing the DCE from other types of radiation in these circuits. We also discuss the similarities and differences between the DCE, in the resonator setup, and the down-conversion of pump photons in parametric oscillators.