Entanglement dynamics of quantum oscillators nonlinearly coupled to thermal environments
Journal article, 2015

We study the asymptotic entanglement of two quantum harmonic oscillators nonlinearly coupled to an environment. Coupling to independent baths and a common bath are investigated. Numerical results obtained using the Wangsness-Bloch-Redfield method are supplemented by analytical results in the rotating wave approximation. The asymptotic negativity as function of temperature, initial squeezing, and coupling strength, is compared to results for systems with linear system-reservoir coupling. We find that, due to the parity-conserving nature of the coupling, the asymptotic entanglement is considerably more robust than for the linearly damped cases. In contrast to linearly damped systems, the asymptotic behavior of entanglement is similar for the two bath configurations in the nonlinearly damped case. This is due to the two-phonon system-bath exchange causing a suppression of information exchange between the oscillators via the bath in the common-bath configuration at low temperatures.

Author

Aurora Voje

Chalmers, Applied Physics, Condensed Matter Theory

Alexander Croy

Chalmers, Applied Physics, Condensed Matter Theory

Andreas Isacsson

Chalmers, Applied Physics, Condensed Matter Theory

Physical Review A - Atomic, Molecular, and Optical Physics

1050-2947 (ISSN) 1094-1622 (eISSN)

Vol. 92 1 012313

Subject Categories

Atom and Molecular Physics and Optics

Condensed Matter Physics

DOI

10.1103/PhysRevA.92.012313

More information

Created

10/7/2017