Squeezing based analytical variational method for the biased quantum Rabi model in the ultrastrong coupling regime

Squeezing based analytical variational method for the biased quantum Rabi model in the ultrastrong coupling regime

In order to obtain the ground state of the biased quantum Rabi model in the ultrastrong coupling regime, a generalized squeezing rotating-wave approximation method including the displacement and the squeezing transformations is proposed in this work. While considering the deformation of the oscillat...

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Veröffentlicht in:Journal of physics. A, Mathematical and theoretical Mathematical and theoretical, 2020-03, Vol.53 (9), p.95302
Hauptverfasser: Xie, Weijie, Mao, Bin-Bin, Li, Guangzhuo, Wang, Weihang, Sun, Chen, Wang, Yimin, You, Wen-Long, Liu, Maoxin
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biased quantum Rabi model
squeezing
ultrastrong coupling
variational method
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container_title Journal of physics. A, Mathematical and theoretical
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creator Xie, Weijie
Mao, Bin-Bin
Li, Guangzhuo
Wang, Weihang
Sun, Chen
Wang, Yimin
You, Wen-Long
Liu, Maoxin
description In order to obtain the ground state of the biased quantum Rabi model in the ultrastrong coupling regime, a generalized squeezing rotating-wave approximation method including the displacement and the squeezing transformations is proposed in this work. While considering the deformation of the oscillator state, our method evidently improves the generalized variational method. The analyses of a few physical quantities show that our method works well especially in the ultrastrong coupling and large atomic frequency regime.
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subjects biased quantum Rabi model
squeezing
ultrastrong coupling
variational method
title Squeezing based analytical variational method for the biased quantum Rabi model in the ultrastrong coupling regime
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