Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 5: Quanteninformation: Konzepte I

Q 5.2: Talk

Monday, March 2, 2009, 11:00–11:15, VMP 6 HS-D

Deterministic purification of an entangled state using a single copy — •Matthias Kleinmann, Oleg Gittsovich, and Otfried Gühne — Institut für Quantenoptik und Quanteninformation, Technikerstraße 21a, 6020 Innsbruck, Austria

Two remote parties cannot prepare any entangled quantum state if the communication between them is limited to be classical. However, if both parties initially share an entangled state it is possible to prepare with a probability of one any state from a certain family of entangled states. While –by definition– the entanglement cannot increase in such a scenario, it might well be possible to achieve a pure final state, even if starting from a mixed initial state [1]. We consider conditions and examples for such purification protocols and study the interlink to the entanglement-preserving distinction of pure states [2].

[1] E. Chitambar et al., arXiv:0811.3739
[2] S. Cohen, Phys. Rev. A 75, 052313 (2007)