dorsal/arxiv
View SchemaWhen are correlations quantum? -- Verification and quantification of entanglement by simple measurements
| Authors | K. M. R. Audenaert, M. B. Plenio |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0608067 |
| URL | https://arxiv.org/abs/quant-ph/0608067 |
| DOI | 10.1088/1367-2630/8/11/266 |
| Journal | New J. Phys. 8, 266 (2006) |
Abstract
The verification and quantification of experimentally created entanglement by simple measurements, especially between distant particles, is an important basic task in quantum processing. When composite systems are subjected to local measurements the measurement data will exhibit correlations, whether these systems are classical or quantum. Therefore, the observation of correlations in the classical measurement record does not automatically imply the presence of quantum correlations in the system under investigation. In this work we explore the question of when correlations, or other measurement data, are sufficient to guarantee the existence of a certain amount of quantum correlations in the system and when additional information, such as the degree of purity of the system, is needed to do so. Various measurement settings are discussed, both numerically and analytically. Exact results and lower bounds on the least entanglement consistent with the observations are presented. The approach is suitable both for the bi-partite and the multi-partite setting.
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"abstract": "The verification and quantification of experimentally created entanglement by\nsimple measurements, especially between distant particles, is an important\nbasic task in quantum processing. When composite systems are subjected to local\nmeasurements the measurement data will exhibit correlations, whether these\nsystems are classical or quantum. Therefore, the observation of correlations in\nthe classical measurement record does not automatically imply the presence of\nquantum correlations in the system under investigation. In this work we explore\nthe question of when correlations, or other measurement data, are sufficient to\nguarantee the existence of a certain amount of quantum correlations in the\nsystem and when additional information, such as the degree of purity of the\nsystem, is needed to do so. Various measurement settings are discussed, both\nnumerically and analytically. Exact results and lower bounds on the least\nentanglement consistent with the observations are presented. The approach is\nsuitable both for the bi-partite and the multi-partite setting.",
"arxiv_id": "quant-ph/0608067",
"authors": [
"K. M. R. Audenaert",
"M. B. Plenio"
],
"categories": [
"quant-ph",
"cond-mat.str-el"
],
"doi": "10.1088/1367-2630/8/11/266",
"journal_ref": "New J. Phys. 8, 266 (2006)",
"title": "When are correlations quantum? -- Verification and quantification of entanglement by simple measurements",
"url": "https://arxiv.org/abs/quant-ph/0608067"
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