Entanglement without hidden nonlocality
We consider Bell tests in which the distant observers can perform local filtering before testing a Bell inequality. Notably, in this setup, certain entangled states admitting a local hidden variable model in the standard Bell scenario can nevertheless violate a Bell inequality after filtering, displ...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2016-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/18/11/113019 |
| _version_ | 1827873560162467840 |
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| author | Flavien Hirsch Marco Túlio Quintino Joseph Bowles Tamás Vértesi Nicolas Brunner |
| author_facet | Flavien Hirsch Marco Túlio Quintino Joseph Bowles Tamás Vértesi Nicolas Brunner |
| author_sort | Flavien Hirsch |
| collection | DOAJ |
| description | We consider Bell tests in which the distant observers can perform local filtering before testing a Bell inequality. Notably, in this setup, certain entangled states admitting a local hidden variable model in the standard Bell scenario can nevertheless violate a Bell inequality after filtering, displaying so-called hidden nonlocality. Here we ask whether all entangled states can violate a Bell inequality after well-chosen local filtering. We answer this question in the negative by showing that there exist entangled states without hidden nonlocality. Specifically, we prove that some two-qubit Werner states still admit a local hidden variable model after any possible local filtering on a single copy of the state. |
| first_indexed | 2024-03-12T16:39:51Z |
| format | Article |
| id | doaj.art-c13f9bd6ba9d435681f5dacf8e763d04 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:39:51Z |
| publishDate | 2016-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-c13f9bd6ba9d435681f5dacf8e763d042023-08-08T14:36:15ZengIOP PublishingNew Journal of Physics1367-26302016-01-01181111301910.1088/1367-2630/18/11/113019Entanglement without hidden nonlocalityFlavien Hirsch0Marco Túlio Quintino1Joseph Bowles2Tamás Vértesi3Nicolas Brunner4Département de Physique Théorique, Université de Genève , 1211 Genève, SwitzerlandDépartement de Physique Théorique, Université de Genève , 1211 Genève, SwitzerlandDépartement de Physique Théorique, Université de Genève , 1211 Genève, SwitzerlandInstitute for Nuclear Research, Hungarian Academy of Sciences, H-4001 Debrecen, PO Box 51, HungaryDépartement de Physique Théorique, Université de Genève , 1211 Genève, SwitzerlandWe consider Bell tests in which the distant observers can perform local filtering before testing a Bell inequality. Notably, in this setup, certain entangled states admitting a local hidden variable model in the standard Bell scenario can nevertheless violate a Bell inequality after filtering, displaying so-called hidden nonlocality. Here we ask whether all entangled states can violate a Bell inequality after well-chosen local filtering. We answer this question in the negative by showing that there exist entangled states without hidden nonlocality. Specifically, we prove that some two-qubit Werner states still admit a local hidden variable model after any possible local filtering on a single copy of the state.https://doi.org/10.1088/1367-2630/18/11/113019Bell nonlocalityhidden nonlocalityentanglementlocal hidden variable modellocal hidden state model |
| spellingShingle | Flavien Hirsch Marco Túlio Quintino Joseph Bowles Tamás Vértesi Nicolas Brunner Entanglement without hidden nonlocality New Journal of Physics Bell nonlocality hidden nonlocality entanglement local hidden variable model local hidden state model |
| title | Entanglement without hidden nonlocality |
| title_full | Entanglement without hidden nonlocality |
| title_fullStr | Entanglement without hidden nonlocality |
| title_full_unstemmed | Entanglement without hidden nonlocality |
| title_short | Entanglement without hidden nonlocality |
| title_sort | entanglement without hidden nonlocality |
| topic | Bell nonlocality hidden nonlocality entanglement local hidden variable model local hidden state model |
| url | https://doi.org/10.1088/1367-2630/18/11/113019 |
| work_keys_str_mv | AT flavienhirsch entanglementwithouthiddennonlocality AT marcotulioquintino entanglementwithouthiddennonlocality AT josephbowles entanglementwithouthiddennonlocality AT tamasvertesi entanglementwithouthiddennonlocality AT nicolasbrunner entanglementwithouthiddennonlocality |