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Quantumness beyond entanglement: the case of symmetric states

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1103/PhysRevA.105.022433
AuthorSearch for: 1ORCID identifier: https://orcid.org/0000-0002-3301-7672; Search for: ORCID identifier: https://orcid.org/0000-0002-3720-5195; Search for: ORCID identifier: https://orcid.org/0000-0003-1967-2766; Search for: ORCID identifier: https://orcid.org/0000-0002-7441-8632
Affiliation
  1. National Research Council of Canada. Security and Disruptive Technologies
FunderSearch for: Horizon 2020; Search for: Ministry of Education and Science of the Russian Federation; Search for: Ministerio de Economía, Industria y Competitividad, Gobierno de España; Search for: Natural Sciences and Engineering Research Council of Canada; Search for: Fundacja na rzecz Nauki Polskiej
FormatText, Article
Abstract
Nowadays, it is accepted that truly quantum correlations can exist even in the absence of entanglement. For the case of symmetric states, a physically trivial unitary transformation can alter a state from entangled to separable, and vice versa. We propose to certify the presence of quantumness via an average of a state's bipartite entanglement properties over all physically relevant modal decompositions. We investigate extremal states for such a measure: SU(2)-coherent states possess the least quantumness, whereas the opposite extreme is inhabited by states with maximally spread Majorana constellations.
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PublisherAmerican Physical Society
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  • Physical Review A 105, no. 2, 022433 (February 2022).
LanguageEnglish
Peer reviewedYes
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Record identifierce35ed5a-a2c5-4aca-8a88-4828fa9e134e
Record created2022-05-24
Record modified2022-05-26
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