Nonorthogonal-qubit-state expansion for the asymmetric quantum Rabi model
Date
2021
Authors
Li, Zimin
Ferri, Devid
Batchelor, Murray
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American Physical Society
Abstract
We present a physically motivated variational wave function for the ground state of the asymmetric quantum Rabi model (AQRM). The wave function is a weighted superposition of squeezed coherent states entangled with nonorthogonal qubit states and relies only on three variational parameters in the regimes of interest where the squeezing effect becomes negligible. The variational expansion describes the ground state remarkably well in almost all parameter regimes, especially with arbitrary bias. We use the variational result to calculate various relevant physical observables of the ground state and make a comparison with existing approximations and the exact solution. The results show that the variational expansion is a significant improvement over the existing approximations for the AQRM.
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Physical Review A
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Journal article
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Open Access
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