Entanglement Dynamics of Quantum Oscillators Nonlinearly Coupled to Thermal Environments
Preprint, 2014

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-Red eld 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 nd 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 con gurations in the nonlinearly damped case. This is due to the two-phonon system-bath exchange causing a supression of information exchange between the oscillators via the bath in the common bath con guration at low temperatures.

Nonlinear quantum dynamics

entanglement

Författare

Aurora Voje

Chalmers, Teknisk fysik, Kondenserade materiens teori

Andreas Isacsson

Chalmers, Teknisk fysik, Kondenserade materiens teori

Alexander Croy

Chalmers, Teknisk fysik, Kondenserade materiens teori

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Fysik

Den kondenserade materiens fysik