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Entanglement dynamics of quantum oscillators nonlinearly coupled to thermal environments

Aurora Voje (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Alexander Croy (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Andreas Isacsson (Institutionen för teknisk fysik, Kondenserade materiens teori)
Physical Review A. Atomic, Molecular, and Optical Physics (1050-2947). Vol. 92 (2015), 1,
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2015-07-28. Senast ändrad 2015-08-25.
CPL Pubid: 220002


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