Ultrastrong Coupling of a Qubit with a Nonlinear Optical Resonator
- URL: http://arxiv.org/abs/2111.13442v3
- Date: Tue, 19 Jul 2022 13:21:28 GMT
- Title: Ultrastrong Coupling of a Qubit with a Nonlinear Optical Resonator
- Authors: Fabio Mauceri, Alberto Mercurio, Salvatore Savasta, Omar Di Stefano
- Abstract summary: We study the interaction of a two-level atom with a single-mode nonlinear electromagnetic resonator.
When the qubit-resonator coupling is very strong, the standard Kerr model for the resonator becomes questionable.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We study the interaction of a two-level atom with a single-mode nonlinear
electromagnetic resonator, considering coupling strengths ranging from zero to
the so-called deep strong coupling regime. When the qubit-resonator coupling is
very strong, the standard Kerr model for the resonator becomes questionable.
Moreover, recently, it has been shown that extra care is needed when
constructing gauge-independent theories in the presence of approximations as
the truncation of the Hilbert space of the matter system. Such a truncation can
ruin gauge invariance leading to non-physical results, especially when the
light-matter interactions strength is very high. Here we face and solve this
issues to provide a consistent nonlinear-resonator quantum Rabi model
satisfying the gauge principle.
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