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arXiv 2007.11969quant-ph
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非对称量子Rabi模型的广义绝热近似:圆锥相交和几何相位

Generalized adiabatic approximation to the asymmetric quantum Rabi model: conical intersections and geometric phases

Zi-Min Li, Devid Ferri, David Tilbrook, Murray T. Batchelor

摘要:

非对称量子拉比模型(AQRM)描述了量子谐振子和偏置量子比特之间的相互作用,它自然地出现在电路量子电动力学电路和器件中。AQRM中隐藏的对称性的存在导致了丰富的能量景观的锥形交叉点(CI),从而有趣的拓扑性质。然而,目前AQRM的近似值无法正确重现这些CI。为了克服这些限制,我们提出了一个广义绝热近似(GAA)来描述AQRM的能谱。这是通过结合微扰绝热近似和AQRM的精确例外解来实现的。GAA对现有的方法进行了实质性的改进,并将微扰处理的极限推到了非微扰区域。作为GAA应用的初步实例,我们计算了与AQRM相关的CI周围的几何相位。

英文摘要:

The asymmetric quantum Rabi model (AQRM), which describes the interaction between a quantum harmonic oscillator and a biased qubit, arises naturally in circuit quantum electrodynamic circuits and devices. The existence of hidden symmetry in the AQRM leads to a rich energy landscape of conical intersections (CIs) and thus to interesting topological properties. However, current approximations to the AQRM fail to reproduce these CIs correctly. To overcome these limitations we propose a generalized adiabatic approximation (GAA) to describe the energy spectrum of the AQRM. This is achieved by combining the perturbative adiabatic approximation and the exact exceptional solutions to the AQRM. The GAA provides substantial improvement to the existing approaches and pushes the limit of the perturbative treatment into non-perturbative regimes. As a preliminary example of the application of the GAA we calculate the geometric phases around CIs associated with the AQRM.

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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