Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 63: Quantum Effects: Entanglement and Decoherence III

Q 63.6: Vortrag

Freitag, 12. März 2010, 15:30–15:45, A 310

Assymptotic multipartite entanglement at finite temperature — •Simeon Sauer, Florian Mintert, and Andreas Buchleitner — Physikalisches Institut Albert-Ludwigs-Universität Freiburg

When a many-body system is coupled to a noisy, thermal environment, it rapidly loses its coherences. Multipartite entanglement relies on such coherences, and therefore decays accordingly; and it does so, the faster, the larger the system and the hotter the environment is. However, external coherent driving is likely to slow down such decay, and it might even stabilize entanglement at a finite level.

Here, we study the entanglement dynamics in a periodically driven many-body system, embedded in a thermal environment. With the help of the Floquet formalism, we identify steady states and characterize their entanglement properties. With this approach, we look for conditions (such as strength and frequency of the driving, and environmental temperature) that maintain a finite amount of multipartite entanglement for asymptotically large times.