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Experimentally revealing anomalously large dipoles in the dielectric of a quantum circuit

Yu, Liuqi ; Matityahu, Shlomi 1; Rosen, Yaniv J.; Hung, Chih-Chiao; Maksymov, Andrii; Burin, Alexander L.; Schechter, Moshe; Osborn, Kevin D.
1 Institut für Theorie der Kondensierten Materie (TKM), Karlsruher Institut für Technologie (KIT)

Abstract:

Quantum two-level systems (TLSs) intrinsic to glasses induce decoherence in many modern quantum devices, such as superconducting qubits. Although the low-temperature physics of these TLSs is usually well-explained by a phenomenological standard tunneling model of independent TLSs, the nature of these TLSs, as well as their behavior out of equilibrium and at high energies above 1 K, remain inconclusive. Here we measure the non-equilibrium dielectric loss of TLSs in amorphous silicon using a superconducting resonator, where energies of TLSs are varied in time using a swept electric field. Our results show the existence of two distinct ensembles of TLSs, interacting weakly and strongly with phonons, where the latter also possesses anomalously large electric dipole moment. These results may shed new light on the low temperature characteristics of amorphous solids, and hold implications to experiments and applications in quantum devices using time-varying electric fields.


Verlagsausgabe §
DOI: 10.5445/IR/1000151773
Veröffentlicht am 25.10.2022
Originalveröffentlichung
DOI: 10.1038/s41598-022-21256-7
Scopus
Zitationen: 2
Web of Science
Zitationen: 4
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theorie der Kondensierten Materie (TKM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000151773
Erschienen in Scientific Reports
Verlag Nature Research
Band 12
Heft 1
Seiten Art.Nr. 16960
Vorab online veröffentlicht am 10.10.2022
Nachgewiesen in Dimensions
Web of Science
Scopus
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