Negativity volume of the generalized Wigner function as an entanglement witness for hybrid bipartite states

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F18%3A73589340" target="_blank" >RIV/61989592:15310/18:73589340 - isvavai.cz</a>
Result on the web
<a href="https://www.nature.com/articles/s41598-018-35330-6" target="_blank" >https://www.nature.com/articles/s41598-018-35330-6</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41598-018-35330-6" target="_blank" >10.1038/s41598-018-35330-6</a>

Result language
angličtina
Original language name
Negativity volume of the generalized Wigner function as an entanglement witness for hybrid bipartite states
Original language description
In a recent paper, Tilma, Everitt et al. derived a generalized Wigner function that can characterize both the discrete and continuous variable states, i.e., hybrid states. As such, one can expect that the negativity of the generalized Wigner function applied to the hybrid states can reveal their nonclassicality, in analogy with the well-known Wigner function defined for the continuous variable states. In this work, we demonstrate that, indeed, the negativity volume of the generalized Wigner function of the hybrid bipartite states can be used as an entanglement witness for such states, provided that it exceeds a certain critical value. In particular, we study hybrid bipartite qubit-bosonic states and provide a qubit-Schrodinger cat state as an example. Since the detection of the generalized Wigner function of hybrid bipartite states in phase space can be experimentally simpler than the tomographic reconstruction of the corresponding density matrix, our results, therefore, present a convenient tool in the entanglement identification of such states.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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