Waveguide quantum optomechanics: parity-time phase transitions in ultrastrong coupling regime

• URL: http://arxiv.org/abs/2007.02071v2
• Date: Wed, 12 Aug 2020 08:19:19 GMT
• Title: Waveguide quantum optomechanics: parity-time phase transitions in ultrastrong coupling regime
• Authors: Ivan Iorsh, Alexander Poshakinskiy, Alexander Poddubny
• Abstract summary: We show that the simplest set-up of two qubits, harmonically trapped over an optical waveguide, enables the ultrastrong coupling regime of the quantum optomechanical interaction. The combination of the inherent open nature of the system and the strong optomechanical coupling leads to emerging parity-time (PT) symmetry. The $mathcalPT$ phase transition drives long-living subradiant states, observable in the state-of-the-art waveguide QED setups.
• Score: 125.99533416395765
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We develop a rigorous theoretical framework for interaction-induced phenomena in the waveguide quantum electrodynamics (QED) driven by mechanical oscillations of the qubits. Specifically, we predict that the simplest set-up of two qubits, harmonically trapped over an optical waveguide, enables the ultrastrong coupling regime of the quantum optomechanical interaction. Moreover, the combination of the inherent open nature of the system and the strong optomechanical coupling leads to emerging parity-time (\PT) symmetry, quite unexpected for a purely quantum system without artificially engineered gain and loss. The $\mathcal{PT}$ phase transition drives long-living subradiant states, observable in the state-of-the-art waveguide QED setups.

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