Thermodynamic Limit in the Two-qubit Quantum Rabi Model with Spin-Spin Coupling

• URL: http://arxiv.org/abs/2310.19595v3
• Date: Mon, 8 Jan 2024 16:17:03 GMT
• Title: Thermodynamic Limit in the Two-qubit Quantum Rabi Model with Spin-Spin Coupling
• Authors: R. Grimaudo, G. Falci, A. Messina, E. Paladino, A. Sergi, E. Solano, and D. Valenti
• Abstract summary: A second-order superradiant quantum phase transition is brought to light in a quantum system consisting of two interacting qubits coupled to the same quantized field mode. We introduce an appropriate thermodynamic-like limit for the integrable two-qubit quantum Rabi model with spin-spin interaction.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The occurrence of a second-order superradiant quantum phase transition is brought to light in a quantum system consisting of two interacting qubits coupled to the same quantized field mode. We introduce an appropriate thermodynamic-like limit for the integrable two-qubit quantum Rabi model with spin-spin interaction. Namely, it is determined by the infinite ratios of the spin-spin and the spin-mode couplings to the mode frequency, regardless of the spin-to-mode frequency ratios.

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