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

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.052306· OSTI ID:21528585

Qinghu, Chen ^[1]; Yuan, Yang ^[1]; Tao, Liu ^[2]; Kelin, Wang ^[3]

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1. Center for Statistical and Theoretical Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004 (China)
2. Department of Physics, Southwest University of Science and Technology, Mianyang 621010 (China)
3. Department of Modern Physics, University of Science and Technology of China, Hefei 230026 (China)

Entanglement evolution of two independent Jaynes-Cummings atoms without the rotating-wave approximation (RWA) is studied by a numerically exact approach. Previous results based on the RWA are essentially modified in the strong-coupling regime (g{>=}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 anticorrelated spins, entanglement sudden death (ESD) is absent in the RWA but does appear in the present numerical calculation without the RWA. Aperiodic entanglement evolution in the strong-coupling regime is observed. The strong atom-cavity coupling facilitates the ESD. The sign of the detuning plays an essential role in the entanglement evolution for strong coupling, which is irrelevant in the RWA. 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 ESD in this system.

• OSTI ID: 21528585
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
97 MATHEMATICS AND COMPUTING
ANALYTIC FUNCTIONS
ANGULAR MOMENTUM
APPROXIMATIONS
ATOMS
BOSONS
CALCULATION METHODS
CAVITIES
ELECTRONIC EQUIPMENT
ELEMENTARY PARTICLES
EQUIPMENT
EVOLUTION
FUNCTIONS
MASSLESS PARTICLES
MATHEMATICAL EVOLUTION
MATHEMATICAL MODELS
PARTICLE MODELS
PARTICLE PROPERTIES
PHOTONS
QUANTUM ENTANGLEMENT
RESONATORS
SPIN
STRONG-COUPLING MODEL