Elliptical rotation of a bosonic oscillator in ultrastrong waveguide QED
Elliptical rotation of a bosonic oscillator in ultrastrong waveguide QED
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超强波导 QED 中玻色子振荡器的椭圆旋转
DOI：
10.1103/physrevresearch.3.023060
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发表时间：
2021
影响因子：
4.2
通讯作者：
Koshino Kazuki
中科院分区：
文献类型：
--
作者：
Koshino Kazuki;Shitara Tomohiro;Ao Ziqiao;Semba Kouichi;Koshino Kazuki
我们研究了线性波导量子电动力学（QED）系统的光响应，即耦合到波导的玻色子振荡器。我们的分析是基于整体哈密顿量的精确对角化，因此即使在波导QED的超强耦合状态下也是严格的。由于振子-波导耦合中的逆旋转项，振子的相空间运动通常是椭圆的，这在超强耦合状态下变得尤为明显。我们还揭示了这种椭圆运动不会传播到输出场中，并给出了反射系数的解析形式，该解析形式相对于共振频率是不对称的。
We investigate the optical response of a linear waveguide quantum electrodynamics (QED) system, namely, a bosonic oscillator coupled to a waveguide. Our analysis is based on exact diagonalization of the overall Hamiltonian and is therefore rigorous even in the ultrastrong-coupling regime of waveguide QED. Owing to the counter-rotating terms in the oscillator-waveguide coupling, the phase-space motion of the oscillator is elliptical in general, and this becomes remarkable in the ultrastrong-coupling regime. We also reveal that such elliptical motion does not propagate into the output field and present an analytic form of the reflection coefficient that is asymmetric with respect to the resonance frequency.