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

Shulga, K. V. 1; Il’ichev, E.; Fistul, M. V.; Besedin, I. S.; Butz, S. 1; Astafiev, O. V.; Hübner, U.; Ustinov, A. V. 1
1 Physikalisches Institut (PHI), Karlsruher Institut für Technologie (KIT)

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.

Verlagsausgabe §
DOI: 10.5445/IR/1000080141
Veröffentlicht am 12.02.2018
DOI: 10.1038/s41467-017-02608-8
Zitationen: 23
Web of Science
Zitationen: 21
Zitationen: 22
Cover der Publikation
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000080141
Erschienen in Nature Communications
Verlag Nature Research
Band 9
Seiten 150
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter Metamaterials; Qubits; Superconducting devices
Nachgewiesen in Web of Science
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