Non-Gaussian superradiant transition via three-body ultrastrong coupling
- URL: http://arxiv.org/abs/2204.03520v1
- Date: Thu, 7 Apr 2022 15:39:21 GMT
- Title: Non-Gaussian superradiant transition via three-body ultrastrong coupling
- Authors: Fabrizio Minganti, Louis Garbe, Alexandre Le Boit\'e, Simone Felicetti
- Abstract summary: We introduce a class of quantum optical Hamiltonian characterized by three-body couplings.
We propose a circuit-QED scheme based on state-of-the-art technology that implements the considered model.
- Score: 62.997667081978825
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We introduce a class of quantum optical Hamiltonian characterized by
three-body couplings, and propose a circuit-QED scheme based on
state-of-the-art technology that implements the considered model. Unlike
two-body light-matter interactions, this three-body coupling Hamiltonian is
exclusively composed of terms which do not conserve the particle number. We
explore the three-body ultrastrong coupling regime, showing the emergence of a
superradiant phase transition which is of first order, is characterized by the
breaking of a $\mathbb{Z}_2\times \mathbb{Z}_2$ symmetry and has a strongly
non-Gaussian nature. Indeed, in contrast to what is observed in any
two-body-coupling model, in proximity of the transition the ground state
exhibits a divergent coskewness, i.e., quantum correlations that cannot be
captured within semiclassical and Gaussian approximations. Furthermore, we
demonstrate the robustness of our findings by including dissipative processes
in the model, showing that the steady-state of the system inherits from the
ground states the most prominent features of the transition.
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