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Observation of decoherence in a carbon nanotube mechanical resonator

Author

Listed:
  • Ben H. Schneider

    (Kavli Institute of Nanoscience, Delft University of Technology)

  • Vibhor Singh

    (Kavli Institute of Nanoscience, Delft University of Technology)

  • Warner J. Venstra

    (Kavli Institute of Nanoscience, Delft University of Technology)

  • Harold B. Meerwaldt

    (Kavli Institute of Nanoscience, Delft University of Technology)

  • Gary A. Steele

    (Kavli Institute of Nanoscience, Delft University of Technology)

Abstract

In physical systems, decoherence can arise from both dissipative and dephasing processes. In mechanical resonators, the driven frequency response measures a combination of both, whereas time-domain techniques such as ringdown measurements can separate the two. Here we report the first observation of the mechanical ringdown of a carbon nanotube mechanical resonator. Comparing the mechanical quality factor obtained from frequency- and time-domain measurements, we find a spectral quality factor four times smaller than that measured in ringdown, demonstrating dephasing-induced decoherence of the nanomechanical motion. This decoherence is seen to arise at high driving amplitudes, pointing to a nonlinear dephasing mechanism. Our results highlight the importance of time-domain techniques for understanding dissipation in nanomechanical resonators, and the relevance of decoherence mechanisms in nanotube mechanics.

Suggested Citation

  • Ben H. Schneider & Vibhor Singh & Warner J. Venstra & Harold B. Meerwaldt & Gary A. Steele, 2014. "Observation of decoherence in a carbon nanotube mechanical resonator," Nature Communications, Nature, vol. 5(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6819
    DOI: 10.1038/ncomms6819
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