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Dynamical decoupling of quantum two-level systems by coherent multiple Landau–Zener transitions

Matityahu, Shlomi; Schmidt, Hartmut; Bilmes, Alexander; Shnirman, Alexander; Weiss, Georg; Ustinov, Alexey V.; Schechter, Moshe; Lisenfeld, Jürgen

Abstract:
Increasing and stabilizing the coherence of superconducting quantum circuits and resonators is of utmost importance for various technologies, ranging from quantum information processors to highly sensitive detectors of low-temperature radiation in astrophysics. A major source of noise in such devices is a bath of quantum two-level systems (TLSs) with broad distribution of energies, existing in disordered dielectrics and on surfaces. Here we study the dielectric loss of superconducting resonators in the presence of a periodic electric bias field, which sweeps near-resonant TLSs in and out of resonance with the resonator, resulting in a periodic pattern of Landau–Zener transitions. We show that at high sweep rates compared to the TLS relaxation rate, the coherent evolution of the TLS over multiple transitions yields a significant reduction in the dielectric loss relative to the intrinsic value. This behavior is observed both in the classical high-power regime and in the quantum single-photon regime, possibly suggesting a viable technique to dynamically decouple TLSs from a qubit.

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Verlagsausgabe §
DOI: 10.5445/IR/1000117795
Veröffentlicht am 19.03.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theorie der Kondensierten Materie (TKM)
Physikalisches Institut (PHI)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2019
Sprache Englisch
Identifikator ISSN: 2056-6387
KITopen-ID: 1000117795
Erschienen in npj Quantum information
Band 5
Heft 1
Seiten Art. Nr.: 114
Vorab online veröffentlicht am 18.12.2019
Nachgewiesen in Web of Science
Scopus
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