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Magnetically induced transparency of a quantum metamaterial composed of twin flux qubits

Author

Listed:
  • K. V. Shulga

    (Karlsruhe Institute of Technology
    National University of Science and Technology MISIS
    Moscow Institute of Physics and Technology)

  • E. Il’ichev

    (Leibniz Institute of Photonic Technology)

  • M. V. Fistul

    (National University of Science and Technology MISIS
    Institute for Basic Science)

  • I. S. Besedin

    (National University of Science and Technology MISIS)

  • S. Butz

    (Karlsruhe Institute of Technology)

  • O. V. Astafiev

    (National University of Science and Technology MISIS
    Moscow Institute of Physics and Technology
    Royal Holloway, University of London)

  • U. Hübner

    (Leibniz Institute of Photonic Technology)

  • A. V. Ustinov

    (Karlsruhe Institute of Technology
    National University of Science and Technology MISIS)

Abstract

Quantum theory is expected to govern the electromagnetic properties of a quantum metamaterial, an artificially fabricated medium composed of many quantum objects acting as artificial atoms. Propagation of electromagnetic waves through such a medium is accompanied by excitations of intrinsic quantum transitions within individual meta-atoms and modes corresponding to the interactions between them. Here we demonstrate an experiment in which an array of double-loop type superconducting flux qubits is embedded into a microwave transmission line. We observe that in a broad frequency range the transmission coefficient through the metamaterial periodically depends on externally applied magnetic field. Field-controlled switching of the ground state of the meta-atoms induces a large suppression of the transmission. Moreover, the excitation of meta-atoms in the array leads to a large resonant enhancement of the transmission. We anticipate possible applications of the observed frequency-tunable transparency in superconducting quantum networks.

Suggested Citation

  • K. V. Shulga & E. Il’ichev & M. V. Fistul & I. S. Besedin & S. Butz & O. V. Astafiev & U. Hübner & A. V. Ustinov, 2018. "Magnetically induced transparency of a quantum metamaterial composed of twin flux qubits," Nature Communications, Nature, vol. 9(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-017-02608-8
    DOI: 10.1038/s41467-017-02608-8
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