Observation of decoherence in a carbon nanotube mechanical resonator

Ben H. Schneider (), Vibhor Singh, Warner J. Venstra, Harold B. Meerwaldt and Gary A. Steele ()
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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

Nature Communications, 2014, vol. 5, issue 1, 1-5

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6819

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