Quantum thermalization and thermal entanglement in the open quantum Rabi model

Abstract

We study quantum thermalization and thermal entanglement in the open quantum Rabi model (QRM), in which a two-level system and a single-mode bosonic field are coupled to either two individual heat baths or a common heat bath. By treating the QRM as an effective multilevel system and deriving global quantum master equations in the eigenstate representation of the QRM, we study the physical conditions for quantum thermalization of the open QRM. It is found that, in the individual heat-bath case, the QRM can only be thermalized when either the two heat baths have the same temperature or the QRM is only coupled to one of the two baths. In the common heat-bath case, differently, the QRM can always be thermalized. We also study thermal entanglement of the QRM in both the resonant- and non-resonant coupling cases. The logarithmic negativity for the thermal state of the QRM is obtained in a wide parameter space, ranging from the low- to high-temperature limits, and from the weak- to deep-strong-coupling regimes. This work paves the way towards the study of quantum effects in nonequilibrium ultrastrongly-coupled light-matter systems.

10 pages, 7 figures

References in corpus (14)

• Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
• Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime
• Deep Strong Coupling Regime of the Jaynes-Cummings model
• Ultra-Strong Light-Matter Coupling Regime with Polariton Dots
• Markovian Master Equations: A Critical Study
• Modeling heat transport through completely positive maps
• The quantum Rabi model: solution and dynamics
• Strong Coupling of a Quantum Oscillator to a Flux Qubit at its Symmetry Point
• Exact Master Equation and Quantum Decoherence of Two Coupled Harmonic Oscillators in a General Environment
• Thermal state entanglement in harmonic lattices
• Steady quantum coherence in non-equilibrium environment
• Dissipation and entanglement dynamics for two interacting qubits coupled to independent reservoirs
• Multifunctional quantum thermal device utilizing three qubits
• Phase-kicked control of counter-rotating interactions in the quantum Rabi model

Cited by in corpus (2)

• Topologically protected subradiant cavity polaritons through linewidth narrowing enabled by dissipationless edge states
• Quantum Features of the Thermal Two-Qubit Quantum Rabi Model in Ultra- and Deep-Strong Regimes