Progress Toward Detection of Individual TLS in Nanomechanical Resonators

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

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-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
Pages (from-to)440-451
Number of pages12
JournalJournal of Low Temperature Physics
Issue number5-6
Early online date19 Mar 2024
Publication statusPublished - Jun 2024
MoE publication typeA1 Journal article-refereed


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


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