Entanglement dynamics of two independent Jaynes-Cummings atoms without rotating-wave approximation

Abstract

Entanglement evolution of two independent Jaynes-Cummings atoms without rotating-wave approximation (RWA) is studied by an numerically exact approach. The previous results in the RWA are essentially modified in the strong coupling regime ($g\ge 0.1$), which has been reached in the recent experiments on the flux qubit coupled to the LC resonator. For the initial Bell state with anti-correlated spins, the entanglement sudden death (ESD) is absent in the RWA, but does appear in the present numerical calculation without RWA. Aperiodic entanglement evolution in the strong coupling regime is observed. The strong atom-cavity coupling facilitates the ESD. The sign of detuning play a essential role in the entanglement evolution for strong coupling, which is irrelevant in the RWA. An analytical results based on an unitary transformation are also given, which could not modify the RWA picture essentially. It is suggested that the activation of the photons may be the origin of the ESD. The present theoretical results could be applied to artificial atoms realized in recent experiments.

16 pages, 8 figures

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• Absence of collapse in quantum Rabi oscillations
• Effects of counter-rotating-wave terms on the non-Markovianity in quantum open systems
• Population inversion and entanglement in single and double glassy Jaynes-Cummings models
• Entanglement dynamics of the ultra-strong coupling three-qubit Dicke model
• Evidence of indistinguishability and entanglement determined by the energy-time uncertainty principle in a system of two strongly coupled bosonic modes
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• Quantum discord dynamics of two qubits in the single-mode cavities
• Unified analytical treatments to qubit-oscillator systems
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• Coupled modes locally interacting with qubits: critical assessment of the rotating wave approximation
• Two-photon statistics of nonclassical radiation in the dissipative finite-size Dicke model
• Quantum Features of the Thermal Two-Qubit Quantum Rabi Model in Ultra- and Deep-Strong Regimes
• Rabi oscillations and entanglement between two atoms interacting by the Rydberg blockade studied by the Jaynes-Cummings Model