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

K. V. Shulga (), E. Il’ichev, M. V. Fistul, I. S. Besedin, S. Butz, O. V. Astafiev, U. Hübner and A. V. Ustinov
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K. V. Shulga: Karlsruhe Institute of Technology
E. Il’ichev: Leibniz Institute of Photonic Technology
M. V. Fistul: National University of Science and Technology MISIS
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
U. Hübner: Leibniz Institute of Photonic Technology
A. V. Ustinov: Karlsruhe Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-017-02608-8

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