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

Shulga, Kirill; Il'ichev, Evgeny; Fistul, Mikhail V.; Besedin, I. S.; Butz, Susanne; Astafiev, Oleg; Hübner, Uwe; Ustinov, Alexey V.
in: Nature Communications (2018) 150-1

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.

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