Generalized quantum Rabi model with both one- and two-photon terms: A concise analytical study

Generalized quantum Rabi model with both one- and two-photon terms: A concise analytical study
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具有单光子项和双光子项的广义量子拉比模型:简明分析研究

DOI:
10.1103/physreva.99.013809
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发表时间:
2018-06
期刊:
影响因子:
2.9
通讯作者:
Chen Qing Hu
Chen Qing Hu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xie You Fei;Duan Liwei;Chen Qing Hu

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在电路量子电动力学系统中出现了一种具有单光子和双光子项的广义量子拉比哈密顿量。通常的宇称对称性在同时存在两种耦合时自然被打破,这使得分析处理变得复杂,即使在旋转波近似中也是如此。本文利用Bogoliubov算子对这一一般模型进行绝热近似,得到了本征值和本征态的一个非常简洁的解析解。虽然绝热近似仅在量子比特频率的消失极限下是精确的,但是在宽参数范围内,某些物理观测量的结果与数值结果吻合得很好。在行波近似中,我们还导出了解析本征解。在此广义模型的拉比振荡中发现两个主要的拉比频率。我们还将本文的分析理论应用于真空拉比分裂。研究发现,正是由于附加双光子耦合项的存在,才出现了一些新的现象。
A generalized quantum Rabi Hamiltonian with both one- and two-photon terms has emerged in the circuit quantum electrodynamics system for a decade. The usual parity symmetry is broken naturally in the simultaneous presence of both couplings, which complicates analytical treatments, even in the rotating wave approximations. In this paper, we propose an adiabatic approximation to this generic model by using Bogoliubov operators, and obtain a very concise analytical solution for both eigenvalues and eigenstates. Although the adiabatic approximation is only exact in the vanishing limit of the qubit frequency, the results for some physical observables nevertheless agree well with the numerical ones in a wide parameter regime. In the rotating-wave approximations, we also derive an analytical eigensolution. Two dominant Rabi frequencies are found in the Rabi oscillations of this generalized model. We also apply the present analytical theory to the vacuum Rabi splitting. It is found that some new phenomena emerge just because of the presence of the additional two-photon coupling term.
双光子量子拉比模型的量子动力学
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