Structural approximations to positive maps and entanglement-breaking channels
2008
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 statepreparation protocol. We also show how our findings can be useful for the design of better and simpler direct entanglement detection methods.
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