Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 63: Quantum Effects: Entanglement and Decoherence III

Q 63.5: Vortrag

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

Optimal quantum many-body dynamics — •Felix Platzer¹, Torsten Scholak¹, Fernando de Melo², Florian Mintert¹, and Andreas Buchleitner¹ — ¹Albert-Ludwigs-Universität Freiburg — ²Katholieke Universiteit Leuven

We investigate the evolution of quantum many-body systems with permanent inter-particle interactions and their ability to evolve into highly entangled states. We are following a statistical approach in which we test the dynamics of coupled spins, a random spatial arrangement of which induces randomly distributed coupling elements. Correlating entanglement properties and transport efficiency over many realizations reveal that high multi-partite entanglement is an indispensable catalyst for energy transport. Whereas optimality is of extreme statistical unlikeliness, we argue that evolution could have found exactly such untypical geometries resulting in the astonishing transport efficiency of biological compounds. In the generic case where the natural coupling mechanism does not result in the evolution to high entanglement we can use suitably tailored time-dependent control fields to steer the system towards a desired class of highly entangled states. In our approach to coherent control this is achieved with the help of a multi-partite entanglement measure as target functional, what leaves the freedom to find those states with given entanglement properties that have advantageous dynamical properties. Applying our framework to NV-centers, we find rapid evolution into those highly entangled states that are robust to against the prevailing decoherence mechanism.