dorsal/arxiv
View SchemaEntanglement swapping of noisy states: A kind of superadditivity in nonclassicality
| Authors | Aditi Sen De, Ujjwal Sen, Caslav Brukner, Vladimir Buzek, Marek Zukowski |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0311194 |
| URL | https://arxiv.org/abs/quant-ph/0311194 |
| DOI | 10.1103/PhysRevA.72.042310 |
| Journal | Phys. Rev. A 72, 042310 (2005) |
Abstract
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.
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"abstract": "We address the question as to whether an entangled state that satisfies local\nrealism will give a violation of the same, after entanglement swapping in a\nsuitable scenario. We consider such possibility as a kind of superadditivity in\nnonclassicality. Importantly, it will indicate that checking for violation of\nlocal realism, in the state obtained after entanglement swapping, can be a\nmethod for detecting entanglement in the input state of the swapping procedure.\nWe investigate various entanglement swapping schemes, which involve mixed\ninitial states. The strength of violation of local realism by the state\nobtained after entanglement swapping, is compared with the one for the input\nstates. We obtain a kind of superadditivity of violation of local realism for\nWerner states, consequent upon entanglement swapping involving\nGreenberger-Horne-Zeilinger state measurements. We also discuss whether\nentanglement swapping of specific states may be used in quantum repeaters with\na substantially reduced need to perform the entanglement distillation step.",
"arxiv_id": "quant-ph/0311194",
"authors": [
"Aditi Sen De",
"Ujjwal Sen",
"Caslav Brukner",
"Vladimir Buzek",
"Marek Zukowski"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.72.042310",
"journal_ref": "Phys. Rev. A 72, 042310 (2005)",
"title": "Entanglement swapping of noisy states: A kind of superadditivity in nonclassicality",
"url": "https://arxiv.org/abs/quant-ph/0311194"
},
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