Detection of nonlocal superpositions

AuthorCount:7;
We study in theory and experiment the verification of the Schmidt number of quantum correlated radiation fields. This measure of entanglement counts the number of global superpositions of product states which are needed to describe a compound quantum system. For unraveling a certain value of this measure, a family of entanglement and Schmidt number tests is constructed. The measurement of the whole class of witnesses is realized. By generating a path entangled two-photon state, we demonstrate the feasibility to directly count quantum superpositions.

Pimenta, W. M. (author)
Marques, B.Stockholms universitet,Fysikum,Universidade Federal de Minas Gerais, Brazil (author)
Matoso, A. A. (author)
Sperling, J. (author)
Vogel, W. (author)
Padua, S. (author)
Stockholms universitetFysikum (creator_code:org_t)

In:Physical Review A. Atomic, Molecular, and Optical Physics90:3, s. 032328-1050-29471094-1622

By the author/editor: Gutierrez-Esparz ...; Pimenta, W. M.; Marques, B.; Matoso, A. A.; Sperling, J.; Vogel, W.; show more...; Padua, S.; show less...

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