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arXiv 1503.01666cond-mat.mes-hallcond-mat.supr-conphysics.atom-phquant-ph
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可调谐超导量子比特-腔系统中的动力学Lamb效应

Dynamical Lamb Effect in a Tunable Superconducting Qubit-Cavity System

D. S. Shapiro, A. A. Zhukov, W. V. Pogosov, Yu. E. Lozovik

摘要:

将自然原子置于含时腔中,由于与量子化光子模的相互作用,原子可以被参量激发。这样一个过程的通道之一是动态兰姆效应,诱导的原子能级兰姆位移的非绝热调制。然而,在自然原子的实验中,很难将这种效应与原子激发的其他机制分开。我们指出,与超导量子比特(人造宏观原子)耦合的传输线腔为观察动力学兰姆效应提供了一个独特的平台。一个关键的想法是利用一个动态可调的量子位谐振器耦合,这是最近实现的。通过非绝热地改变耦合,即使腔最初是空的,也可以通过兰姆位移的非绝热调制来参数化地激发量子比特。在具有时变耦合常数的Rabi模型中,超越旋转波近似,研究了这样一个耦合系统的动力学。提出了一种有效的方法,通过周期性和非绝热开关的量子比特谐振器耦合能量来增加效果。

英文摘要:

A natural atom placed into a cavity with time-dependent parameters can be parametrically excited due to the interaction with the quantized photon mode. One of the channels of such a process is the dynamical Lamb effect, induced by a nonadiabatic modulation of atomic level Lamb shift. However, in experiments with natural atoms it is quite difficult to isolate this effect from other mechanisms of atom excitation. We point out that a transmission line cavity coupled with a superconducting qubit (artificial macroscopic atom) provides a unique platform for the observation of the dynamical Lamb effect. A key idea is to exploit a dynamically tunable qubit-resonator coupling, which was implemented quite recently. By varying nonadiabatically the coupling, it is possible to parametrically excite a qubit through a nonadiabatic modulation of the Lamb shift, even if the cavity was initially empty. A dynamics of such a coupled system is studied within the Rabi model with time-dependent coupling constant and beyond the rotating wave approximation. An efficient method to increase the effect through the periodic and nonadiabatic switching of a qubit-resonator coupling energy is proposed.

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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