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Waveguide bandgap engineering with an array of superconducting qubits

Brehm, Jan David 1; Poddubny, Alexander N.; Stehli, Alexander 1; Wolz, Tim 1; Rotzinger, Hannes 2; Ustinov, Alexey V. 2
1 Karlsruher Institut für Technologie (KIT)
2 Institut für Quantenmaterialien und -technologien (IQMT), Karlsruher Institut für Technologie (KIT)

Waveguide quantum electrodynamics offers a wide range of possibilities to effectively engineer interactions between artificial atoms via a one-dimensional open waveguide. While these interactions have been experimentally studied in the few qubit limit, the collective properties of such systems for larger arrays of qubits in a metamaterial configuration has so far not been addressed. Here, we experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control coupled to the mode continuum of a waveguide. By consecutively tuning the qubits to a common resonance frequency we observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. Making use of the qubits quantum nonlinearity, we demonstrate control over the latter by inducing a transparency window in the bandgap region of the ensemble. The circuit of this work extends experiments with one and two qubits toward a full-blown quantum metamaterial, thus paving the way for large-scale applications in superconducting waveguide quantum electrodynamics.

Verlagsausgabe §
DOI: 10.5445/IR/1000131804
Veröffentlicht am 22.04.2021
DOI: 10.1038/s41535-021-00310-z
Zitationen: 12
Web of Science
Zitationen: 11
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2021
Sprache Englisch
Identifikator ISSN: 2397-4648
KITopen-ID: 1000131804
HGF-Programm 47.12.01 (POF IV, LK 01) Advanced Solid-State Qubits and Qubit Systems
Erschienen in npj quantum materials
Verlag Nature Research
Band 6
Heft 1
Seiten Art. Nr.: 10
Vorab online veröffentlicht am 04.02.2021
Nachgewiesen in Dimensions
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