The Schmidt number as a universal entanglement measure

Details The Schmidt number as a universal entanglement measure The Schmidt number as a universal entanglement measure

2009-08-27

arxiv.org/abs/0908.3974v3

Phys. Scr. 83, 045002 (2011)

Physics

Quantum Physics

8 pages, Phys. Scr. in press, for previous Section IV see manuscript "Determination of the Schmidt number"

Scientific paper

The class of local invertible operations is defined and the invariance of entanglement under such operations is established. For the quantification of entanglement, universal entanglement measures are defined, which are invariant under local invertible transformations. They quantify entanglement in a very general sense. It is shown that the Schmidt number is a universal entanglement measure, which is most important for the general amount of entanglement. For special applications, pseudo-measures are defined to quantify the useful entanglement for a certain quantum task. The entanglement quantification is further specified by operational measures, which include the accessible observables by a given experimental setup.

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