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Q: Quantenoptik und Photonik

Q 3: Poster Quanteninformation, -kommunikation und Quantencomputer

Q 3.10: Poster

Freitag, 4. März 2005, 11:00–12:30, Poster HU

Programmable discrimination for unknown qudit states — •Stefan T. Probst-Schendzielorz¹, Matthias Freyberger¹, János Bergou², and Igor Jex³ — ¹Abteilung für Quantenphysik, Universität Ulm, 89069 Ulm — ²Department of Physics, CUNY Hunter College, 695 Park Avenue, New York, NY 10021, USA — ³Department of Physics, FNSPE, Czech Technical University Prague, Brehova 7, 115 19 Praha, Czech Republic

Unambiguous discrimination of two unknown quantum states, especially if they are non-orthogonal, is a challenging problem. But if there are copies of the states provided, the discrimination of the states is possible based on symmetry arguments. We present a POVM for this scheme generalized for d-dimensional systems. To optimize our POVM, we need to know the occurrence probabilities. Therefore, we adapt stepwise the parameters of the POVM and compare this to projection measurements.