Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Quantum Information: Concepts and Methods 1
Q 7.6: Vortrag
Montag, 14. März 2011, 11:45–12:00, SCH A118
Maximizing entanglement with numerically optimized pulse design — •Fabian Bohnet-Waldraff1, Florian Mintert2, Uwe Sanders3, Steffen Glaser3, and Andreas Buchleitner1 — 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg — 2Freiburg Institute for Advanced Studies (FRIAS), Albert-Ludwigs-Universität Freiburg, Albertstraße 19, 79104 Freiburg — 3Department of Chemistry, Technical University of Munich, D-85747 Garching
The design of optimal pulse shapes, e.g. by means of the GRAPE algorithm [1], permits the accurate preparation of general quantum states. On the other hand, there are vital advantages in optimizing entanglement itself (as quantified, e.g. by a suitable entanglement measure) [2] rather than the fidelity with respect to a given entangled state. Like most techniques from optimal control theory, the GRAPE algorithm has been designed to target a specific state and, therefore, is not necessarily applicable to an entanglement measure as a target functional, since such measures are not maximized by a unique state. We discuss how GRAPE can be extended accordingly such that it permits the optimization of many-body entanglement in noisy environments. As a specific situation we apply this framework to nitrogen vacancy centers in diamond.
[1] N. Khaneja, T. Reiss, C. Kehlet, T. Schulte-Herbrüggen, S. J. Glaser, J. Magn. Reson. 172, 296-305 (2005).
[2] F. Platzer, F. Mintert, A. Buchleitner, PRL 105, 020501 (2010).