dorsal/arxiv
View SchemaBetter Bell Inequality Violation by Collective Measurements
| Authors | Yeong-Cherng Liang, Andrew C. Doherty |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0604045 |
| URL | https://arxiv.org/abs/quant-ph/0604045 |
| DOI | 10.1103/PhysRevA.73.052116 |
| Journal | Physical Review A, vol. 73, art. 052116 (2006) |
Abstract
The standard Bell inequality experiments test for violation of local realism by repeatedly making local measurements on individual copies of an entangled quantum state. Here we investigate the possibility of increasing the violation of a Bell inequality by making collective measurements. We show that nonlocality of bipartite pure entangled states, quantified by their maximal violation of the Bell-Clauser-Horne inequality, can always be enhanced by collective measurements, even without communication between the parties. For mixed states we also show that collective measurements can increase the violation of Bell inequalities, although numerical evidence suggests that the phenomenon is not common as it is for pure states.
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"abstract": "The standard Bell inequality experiments test for violation of local realism\nby repeatedly making local measurements on individual copies of an entangled\nquantum state. Here we investigate the possibility of increasing the violation\nof a Bell inequality by making collective measurements. We show that\nnonlocality of bipartite pure entangled states, quantified by their maximal\nviolation of the Bell-Clauser-Horne inequality, can always be enhanced by\ncollective measurements, even without communication between the parties. For\nmixed states we also show that collective measurements can increase the\nviolation of Bell inequalities, although numerical evidence suggests that the\nphenomenon is not common as it is for pure states.",
"arxiv_id": "quant-ph/0604045",
"authors": [
"Yeong-Cherng Liang",
"Andrew C. Doherty"
],
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"quant-ph"
],
"doi": "10.1103/PhysRevA.73.052116",
"journal_ref": "Physical Review A, vol. 73, art. 052116 (2006)",
"title": "Better Bell Inequality Violation by Collective Measurements",
"url": "https://arxiv.org/abs/quant-ph/0604045"
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