Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 40: Quanteninformation III

Q 40.6: Talk

Wednesday, March 15, 2006, 12:25–12:40, HI

Purifying and Reversible Physical Maps — •Matthias Kleinmann, Hermann Kampermann, Tim Meyer, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany

The laws of quantum mechanics only allow constant universal purifying processes, i.e. any process which maps an unknown quantum state to a pure state has to be constant. Furthermore, a universal reversible process cannot increase the purity of any state. But it can be shown, that a restriction of the set of input states makes purifying or reversible processes possible and can even allow physical maps, which combine both properties.
[1] M.Kleinmann, H. Kampermann, T.Meyer, and D. Bruß (2005), quant-ph/0509100.