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Magnon-magnon entanglement and its quantification via a microwave cavity
Department of Applied Mathematics and Computer Science, Faculty of Mathematics and Statistics, University of Isfahan, Isfahan, Iran; Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University Center, Stockholm, Sweden.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden; Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University Center, Stockholm, Sweden; Swedish e-Science Research Center, KTH Royal Institute of Technology, Stockholm, Sweden.
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2021 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 104, no 22, article id 224302Article in journal (Refereed) Published
Abstract [en]

Quantum magnonics is an emerging research field, with great potential for applications in magnon based hybrid systems and quantum information processing. Quantum correlation, such as entanglement, is a central resource in many quantum information protocols that naturally comes about in any study toward quantum technologies. This applies also to quantum magnonics. Here, we investigate antiferromagnetic coupling of two ferromagnetic sublattices that can have two different magnon modes. We show how this may lead to experimentally measurable bipartite continuous-variable magnon-magnon entanglement. The entanglement can be fully characterized via a single squeezing parameter or, equivalently, entanglement parameter. The clear relation between the entanglement parameter and the Einstein, Podolsky, and Rosen (EPR) function of the ground state opens up for experimental quantification magnon-magnon continuous-variable entanglement and EPR nonlocality. We propose a practical experimental realization to measure the EPR function of the ground state, in a setting that relies on magnon-photon interaction in a microwave cavity.

Place, publisher, year, edition, pages
American Physical Society , 2021. Vol. 104, no 22, article id 224302
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:oru:diva-96727DOI: 10.1103/PhysRevB.104.224302ISI: 000744217400001Scopus ID: 2-s2.0-85121210223OAI: oai:DiVA.org:oru-96727DiVA, id: diva2:1632577
Funder
Knut and Alice Wallenberg Foundation, 2018.0060Swedish Research Council, 2015-04608 2016-05980 2019-05304 2019-03666 2017-03832Swedish Foundation for Strategic Research eSSENCE - An eScience CollaborationStandUp
Note

Funding agencies:

Swedish Energy Agency Materials & Energy Research Center (MERC)

European Research Council (ERC) 854843

Available from: 2022-01-27 Created: 2022-01-27 Last updated: 2022-01-27Bibliographically approved

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Eriksson, OlleThonig, Danny

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