dc.identifier.uri |
http://dx.doi.org/10.15488/1228 |
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dc.identifier.uri |
http://www.repo.uni-hannover.de/handle/123456789/1253 |
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dc.contributor.author |
Vitagliano, Giuseppe
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|
dc.contributor.author |
Apellaniz, Iagoba
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dc.contributor.author |
Kleinmann, M.
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dc.contributor.author |
Lücke, Bernd
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dc.contributor.author |
Klempt, Carsten
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dc.contributor.author |
Toth, Geza
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dc.date.accessioned |
2017-03-31T06:25:34Z |
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dc.date.available |
2017-03-31T06:25:34Z |
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dc.date.issued |
2017 |
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dc.identifier.citation |
Vitagliano, G.; Apellaniz, I.; Kleinmann, M.; Lücke, Bernd; Klempt, Carsten et al.: Entanglement and extreme spin squeezing of unpolarized states. In: New Journal of Physics 19 (2017), Nr. 1, 13027. DOI: https://doi.org/10.1088/1367-2630/19/1/013027 |
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dc.description.abstract |
We present criteria to detect the depth of entanglement in macroscopic ensembles of spin-j particles using the variance and second moments of the collective spin components. The class of states detected goes beyond traditional spin-squeezed states by including Dicke states and other unpolarized states. The criteria derived are easy to evaluate numerically even for systems of very many particles and outperform past approaches, especially in practical situations where noise is present. We also derive analytic lower bounds based on the linearization of our criteria, which make it possible to define spin-squeezing parameters for Dicke states. In addition, we obtain spin squeezing parameters also from the condition derived in (Sørensen and Mølmer 2001 Phys. Rev. Lett. 86 4431). We also extend our results to systems with fluctuating number of particles. |
eng |
dc.description.sponsorship |
FQXi/FQXi-RFP-1608 |
|
dc.description.sponsorship |
EU/ERC/Starting Grant 258647 |
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dc.description.sponsorship |
EU/ERC/CHIST-ERA QUASAR |
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dc.description.sponsorship |
EU/ERC/COST Action CA15220 |
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dc.description.sponsorship |
MINECO/FIS2012-36673-C03-03 |
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dc.description.sponsorship |
MINECO/FIS2015-67161-P |
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dc.description.sponsorship |
Basque Government/IT4720-10 |
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dc.description.sponsorship |
National Research Fund of Hungary OTKA/K83858 |
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dc.description.sponsorship |
DFG/KL 2726/2-1 |
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dc.description.sponsorship |
DFG/EXC/QUEST |
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dc.description.sponsorship |
DFG/RTG/1729 |
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dc.description.sponsorship |
DFG/CRC/1227 |
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dc.description.sponsorship |
DFG/EMRP |
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dc.language.iso |
eng |
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dc.publisher |
Bristol : Institute of Physics Publishing |
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dc.relation.ispartofseries |
New Journal of Physics 19 (2017), Nr. 1 |
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dc.rights |
CC BY 3.0 Unported |
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dc.rights.uri |
https://creativecommons.org/licenses/by/3.0/ |
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dc.subject |
Dicke states |
eng |
dc.subject |
entanglement detection |
eng |
dc.subject |
quantum entanglement |
eng |
dc.subject |
spin squeezing |
eng |
dc.subject |
Quantum theory |
eng |
dc.subject |
Collective spin |
eng |
dc.subject |
Dicke states |
eng |
dc.subject |
Entanglement detection |
eng |
dc.subject |
Lower bounds |
eng |
dc.subject |
Second moments |
eng |
dc.subject |
Spin squeezed state |
eng |
dc.subject |
Spin squeezing |
eng |
dc.subject |
Quantum entanglement |
eng |
dc.subject.ddc |
530 | Physik
|
ger |
dc.title |
Entanglement and extreme spin squeezing of unpolarized states |
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dc.type |
Article |
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dc.type |
Text |
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dc.relation.issn |
1367-2630 |
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dc.relation.doi |
https://doi.org/10.1088/1367-2630/19/1/013027 |
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dc.bibliographicCitation.issue |
1 |
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dc.bibliographicCitation.volume |
19 |
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dc.bibliographicCitation.firstPage |
13027 |
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dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
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