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 limit for the integrable two-qubit quantum Rabi model with spin-spin interaction. Namely, this limit 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.
Grimaudo, R., Falci, G., Messina, A., Paladino, E., Sergi, A., Solano, E., et al. (2024). Thermodynamic limit in the two-qubit quantum Rabi model with spin-spin coupling. PHYSICAL REVIEW RESEARCH, 6(4) [10.1103/physrevresearch.6.043298].
Thermodynamic limit in the two-qubit quantum Rabi model with spin-spin coupling
Valenti, D.
2024-12-20
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 limit for the integrable two-qubit quantum Rabi model with spin-spin interaction. Namely, this limit 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.File | Dimensione | Formato | |
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