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DOI: 10.5445/IR/1000080141
Veröffentlicht am 12.02.2018

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

Shulga, K. V.; Il’ichev, E.; Fistul, M. V.; Besedin, I. S.; Butz, S.; Astafiev, O. V.; Hübner, U.; Ustinov, A. V.

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.


Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2041-1723
URN: urn:nbn:de:swb:90-801419
KITopen ID: 1000080141
Erschienen in Nature Communications
Band 9
Seiten 150
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Metamaterials; Qubits; Superconducting devices
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