Magnetically induced transparency of a quantum metamaterial composed of twin flux qubits. / Shulga, K V; Il’ichev, E ; Fistul, M V; Besedin, Ilia; Butz, S; Astafiev, Oleg; Hübner, U; Ustinov, A. V.

In: Nature Communications, Vol. 9, 150, 11.01.2018, p. 1-6.

Research output: Contribution to journalArticle



  • K V Shulga
  • E Il’ichev
  • M V Fistul
  • Ilia Besedin
  • S Butz
  • Oleg Astafiev
  • U Hübner
  • A. V. Ustinov


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.
Original languageEnglish
Article number150
Pages (from-to)1-6
Number of pages6
JournalNature Communications
Publication statusPublished - 11 Jan 2018
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

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