Progress Toward Detection of Individual TLS in Nanomechanical Resonators

Richard Pedurand, Ilya Golokolenov, Mika Sillanpää, Laure Mercier de Lépinay, Eddy Collin, Andrew Fefferman

Research output: Contribution to journalArticlepeer-review


The low-temperature properties of amorphous solids are usually explained in terms of atomic-scale tunneling two level systems (TLS). For almost 20 years, individual TLS have been probed in insulating layers of superconducting quantum circuits. Detecting individual TLS in mechanical systems has been proposed but not definitively demonstrated. We describe an optomechanical system that is appropriate for this goal and describe our progress toward achieving it. In particular, we show that the expected coupling between the mechanical mode and a resonant TLS is strong enough for high visibility of a TLS given the linewidth of the mechanical mode. Furthermore, the electronic noise level of our measurement system is low enough, and the anomalous force noise observed in other nanomechanical devices is absent.

Original languageEnglish
JournalJournal of Low Temperature Physics
Publication statusAccepted/In press - 2024
Externally publishedYes


  • Microwave optomechanics
  • Nanomechanics
  • Nuclear demagnetization refrigeration
  • Two level systems (TLS)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


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