Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 52: Quanteninformation: Quantenkommunikation II
Q 52.6: Vortrag
Donnerstag, 5. März 2009, 17:45–18:00, Audi-B
Communicating at the quantum speed limit using optimal control — •Michael Murphy1, Tommaso Caneva3, Simone Montangero1, Vittorio Giovanetti2, Tommaso Calarco1, Rosario Fazio2,3, and Guiseppe Santoro3 — 1Institut für Quanteninformationsverarbeitung, Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany — 2NEST-CNR-INFM & Scuola Normale Superiore, P.zza dei Cavalieri 7,56126 Pisa, Italy — 3International School for Advanced Studies (SISSA), Via Beirut 2-4, I-34014 Trieste, Italy
Optimal control theory is a promising candidate for a drastic improvement of the performance of quantum information tasks. We explore its ultimate limit in the case of a one-dimensional chain of coupled spin-1/2 particles, and demonstrate that it coincides with the ultimate speed limit allowed by quantum evolution (the quantum speed limit), such that optimal control reaches the best performance allowed by the laws of quantum mechanics.