Year: 2021
Type: preprint
Abstract: We demonstrate that soft-clamped silicon nitride strings with large aspect ratio can be operated at \si{\milli\kelvin} temperatures. The quality factors ($Q$) of two measured devices show consistent dependency on the cryostat temperature, with soft-clamped mechanical modes reaching $Q > 10^9$ at $46~\mathrm{mK}$. For low optical readout power, $Q$ is found to saturate, indicating good thermalization between the sample and the stage it is mounted on. Our best device exhibits a force sensitivity of $9.6~\mathrm{zN}/\sqrt{\mathrm{Hz}}$ and a thermal decoherence time of $0.38~\mathrm{s}$ which bode well for future applications such as nanomechanical force sensing and beyond.
Source: arXiv (Cornell University)
Authors: Gisler, Thomas, Helal, Mohamed, Sabonis, Deividas, Grob, Urs, H\'eritier, Martin, Degen, Christian L., Ghadimi, Amir H., Eichler, Alexander
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2884930678, G7588216608
OpenAlex ID: W4293834963