Osnabrück 2002 – wissenschaftliches Programm

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Q: Quantenoptik

Q 432: Poster: Quanteninformation

Q 432.7: Poster

Donnerstag, 7. März 2002, 16:30–18:30, Schloss

Optimal two-particle entanglement by universal quantum processes — •Gernot Alber¹, Aldo Delgado¹, and Igor Jex² — ¹Abteilung für Quantenphysik, Universität Ulm, D-89069 Ulm, Germany — ²Department of Physics, FNSPE Czech Technical University Prague, 115 19 Praha, Czech Republic

Universal (covariant) two-particle entanglement processes are analyzed in arbitrary dimensional Hilbert spaces [1]. On the basis of this analysis the class of possible optimal universal entanglement processes is determined whose resulting output states do not contain any separable states. It is shown that these processes form a one-parameter family. For all Hilbert space dimensions larger than two the resulting optimally entangled output states are mixtures of anti-symmetric states which are entangled freely and which also preserve information about input states. Within this one-parameter family there is only one process by which all information about any input state is destroyed completely.
This work is supported by the DFG within the SPP ‘Quanteninformationsverarbeitung’ and by the DLR. I.J. acknowledges support by the GA of the Czech Republic.

[1] G. Alber, A. Delgado, I. Jex, QIC 1, 33 (2001).