Osnabrück 2002 – scientific programme
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Q: Quantenoptik
Q 432: Poster: Quanteninformation
Q 432.7: Poster
Thursday, March 7, 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).