Rabi noise spectroscopy of individual two-level tunneling defects

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

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Understanding the nature of two-level tunneling defects is important for minimizing their disruptive effects in various nanodevices. By exploiting the resonant coupling of these defects to a superconducting qubit, one can probe and coherently manipulate them individually. In this work, we utilize a phase qubit to induce Rabi oscillations of single tunneling defects and measure their dephasing rates as a function of the defect's asymmetry energy, which is tuned by an applied strain. The dephasing rates scale quadratically with the external strain and are inversely proportional to the Rabi frequency. These results are analyzed and explained within a model of interacting defects, in which pure dephasing of coherent high-frequency (gigahertz) defects is caused by interaction with incoherent low-frequency thermally excited defects. Our analysis sets an upper bound for the relaxation rates of thermally excited defects interacting strongly with strain fields.

Original languageEnglish
Article number241409
JournalPhysical Review B
Issue number24
StatePublished - 28 Jun 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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