Intrinsic noise properties of atomic point contact displacement detectors.

@article{FlowersJacobs2007IntrinsicNP,
  title={Intrinsic noise properties of atomic point contact displacement detectors.},
  author={Nathan E. Flowers-Jacobs and David R. Schmidt and Konrad W. Lehnert},
  journal={Physical review letters},
  year={2007},
  volume={98 9},
  pages={096804}
}
We measure the noise added by an atomic point contact operated as a displacement detector. With a microwave technique, we increase the measurement speed of atomic point contacts by a factor of 500. The measurement is then fast enough to detect the resonant motion of a nanomechanical beam at frequencies up to 60 MHz and sensitive enough to observe the random thermal motion of the beam at 250 mK. We demonstrate a shot-noise limited imprecision of 2.3 fm/square root[Hz] and observe a 78 aN/square… CONTINUE READING