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Q: Quantenoptik

Q 31: Quanteninformation III

Q 31.8: Vortrag

Donnerstag, 6. April 2000, 16:00–16:15, HS XII

Catalysis of entanglement manipulation for mixed states — •Jens Eisert and Martin Wilkens — Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam

In the light of recent progress in quantum information theory entanglement is often viewed as the essential resource for processing and transmitting quantum information. As has been demonstrated in Ref. [1], entanglement is indeed an intriguing resource: the mere presence of entanglement can be an advantage when processing quantum information with the use of local quantum operations and classical information (LQCC). The class of operations that can be performed under LQCC on a bipartite quantum system in a pure state is strictly larger when additional quantum systems in an entangled state are accessible than without such “catalyst states”, even though these auxiliary quantum systems are left in exactly the same state.

In practical applications one would expect to always deal with entangled mixed states rather than with pure states. In this work we investigate this phenomenon of catalysis of entanglement manipulation for mixed states. Several aspects will be addressed, such as purification procedures and the possibility of small transformations.
[1] D. Jonathan and M.B. Plenio, Phys. Rev. Lett. 83, 3566 (1999).