Physics – Quantum Physics
Scientific paper
2003-11-27
Phys. Rev. A 72, 042310 (2005)
Physics
Quantum Physics
11 pages, 6 figures, RevTeX4; v2: new discussions added, published version
Scientific paper
10.1103/PhysRevA.72.042310
We address the question as to whether an entangled state that satisfies local realism will give a violation of the same, after entanglement swapping in a suitable scenario. We consider such possibility as a kind of superadditivity in nonclassicality. Importantly, it will indicate that checking for violation of local realism, in the state obtained after entanglement swapping, can be a method for detecting entanglement in the input state of the swapping procedure. We investigate various entanglement swapping schemes, which involve mixed initial states. The strength of violation of local realism by the state obtained after entanglement swapping, is compared with the one for the input states. We obtain a kind of superadditivity of violation of local realism for Werner states, consequent upon entanglement swapping involving Greenberger-Horne-Zeilinger state measurements. We also discuss whether entanglement swapping of specific states may be used in quantum repeaters with a substantially reduced need to perform the entanglement distillation step.
Brukner Caslav
Buzek Vladimir
De Aditi Sen
Sen Ujjwal
Zukowski Marek
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