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  Connecting Fano interference and the Jaynes-Cummings model in cavity magnonics

Gollwitzer, J., Bocklage, L., Röhlsberger, R., & Meier, G. (2021). Connecting Fano interference and the Jaynes-Cummings model in cavity magnonics. npj Quantum Information, 7(1): 114. doi:10.1038/s41534-021-00445-8.

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https://dx.doi.org/10.1038/s41534-021-00445-8 (Publisher version)
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Gollwitzer, J.1, Author
Bocklage, L.1, 2, Author
Röhlsberger, R.1, 2, 3, 4, 5, Author
Meier, G.2, 6, Author              
Affiliations:
1Deutsches Elektronen-Synchrotron DESY, ou_persistent22              
2The Hamburg Centre for Ultrafast Imaging, ou_persistent22              
3Institut für Optik and Quantenelektronik, Friedrich-Schiller-Universität Jena, ou_persistent22              
4Helmholtz Institut Jena, ou_persistent22              
5Helmholtz Centre for Heavy Ion Research (GSI), ou_persistent22              
6Dynamics and Transport in Nanostructures, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074319              

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 Abstract: We show that Fano interference can be realized in a macroscopic microwave cavity coupled to a spin ensemble at room temperature. Via a formalism developed from the linearized Jaynes-Cummings model of cavity electromagnonics, we show that generalized Fano interference emerges from the photon–magnon interaction at low cooperativity. In this regime, the reflectivity approximates the scattering cross-section derived from the Fano-Anderson model. Although asymmetric lineshapes in this system are often associated with the Fano formalism, we show that whilst Fano interference is actually present, an exact Fano form cannot be achieved from the linear Jaynes-Cummings model. In the Fano model an additional contribution arises, which is attributed to decoherence in other systems, and in this case is due to the resonant nature of the photonic mode. The formalism is experimentally verified and accounts for the asymmetric lineshapes arising from the interaction between magnon and photon channels. As the magnon–photon coupling strength is increased, these channels merge into hybridized magnon–photon modes and the generalized Fano interference picture breaks down. Our results are universally applicable to systems underlying the linearized Jaynes-Cummings Hamiltonian at low cooperativity and connect the microscopic parameters of the quantum optical model to generalized Fano lineshapes.

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Language(s): eng - English
 Dates: 2021-02-032021-06-092021-07-19
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41534-021-00445-8
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Title: npj Quantum Information
  Abbreviation : npj Quantum Inf.
Source Genre: Journal
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Publ. Info: Nature Publishing Group
Pages: - Volume / Issue: 7 (1) Sequence Number: 114 Start / End Page: - Identifier: ISSN: 2056-6387
CoNE: https://pure.mpg.de/cone/journals/resource/2056-6387