dorsal/arxiv
View SchemaEffect of noise and enhancement of nonlocality in on/off photodetection
| Authors | Carmen Invernizzi, Stefano Olivares, Matteo G. A. Paris, Konrad Banaszek |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0507057 |
| URL | https://arxiv.org/abs/quant-ph/0507057 |
| DOI | 10.1103/PhysRevA.72.042105 |
| Journal | Phys. Rev. A 72, 042105 (2005). |
Abstract
Nonlocality of two-mode states of light is addressed by means of CHSH inequality based on displaced on/off photodetection. Effects due to non-unit quantum efficiency and nonzero dark counts are taken into account. Nonlocality of both balanced and unbalanced superpositions of few photon-number states, as well as that of multiphoton twin beams, is investigated. We find that unbalanced superpositions show larger nonlocality than balanced one when noise affects the photodetection process. De-Gaussification by means of (inconclusive) photon subtraction is shown to enhance nonlocality of twin beams in the low energy regime. We also show that when the measurement is described by a POVM, rather than a set of projectors, the maximum achievable value of the Bell parameter in the CHSH inequality is decreased, and is no longer given by the Cirel'son bound.
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"abstract": "Nonlocality of two-mode states of light is addressed by means of CHSH\ninequality based on displaced on/off photodetection. Effects due to non-unit\nquantum efficiency and nonzero dark counts are taken into account. Nonlocality\nof both balanced and unbalanced superpositions of few photon-number states, as\nwell as that of multiphoton twin beams, is investigated. We find that\nunbalanced superpositions show larger nonlocality than balanced one when noise\naffects the photodetection process. De-Gaussification by means of\n(inconclusive) photon subtraction is shown to enhance nonlocality of twin beams\nin the low energy regime. We also show that when the measurement is described\nby a POVM, rather than a set of projectors, the maximum achievable value of the\nBell parameter in the CHSH inequality is decreased, and is no longer given by\nthe Cirel\u0027son bound.",
"arxiv_id": "quant-ph/0507057",
"authors": [
"Carmen Invernizzi",
"Stefano Olivares",
"Matteo G. A. Paris",
"Konrad Banaszek"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.72.042105",
"journal_ref": "Phys. Rev. A 72, 042105 (2005).",
"title": "Effect of noise and enhancement of nonlocality in on/off photodetection",
"url": "https://arxiv.org/abs/quant-ph/0507057"
},
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