Structural approximations to positive maps and entanglement-breaking channels

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Structural approximations to positive, but not completely positive maps are approximate physical realizations of these nonphysical maps. They find applications in the design of direct entanglement-detection methods. We show that many of these approximations, in the relevant case of optimal positive maps, define an entanglement breaking channel and, consequently, can be implemented via a measurement and state-preparation protocol. We also show how our findings can be useful for the design of better and simpler direct entanglement detection methods.
Publisher
AMER PHYSICAL SOC
Issue Date
2008-12
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW A, v.78, no.6

ISSN
1050-2947
DOI
10.1103/PhysRevA.78.062105
URI
http://hdl.handle.net/10203/244385
Appears in Collection
EE-Journal Papers(저널논문)
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