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

Abstract

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
DOIs
Publication statusE-pub ahead of print - 19 Mar 2024
MoE publication typeA1 Journal article-refereed

Keywords

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

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