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Quantum nondemolition measurement of mechanical motion quanta

Author

Listed:
  • Luca Dellantonio

    (University of Copenhagen
    University of Copenhagen)

  • Oleksandr Kyriienko

    (University of Copenhagen
    KTH Royal Institute of Technology and Stockholm University)

  • Florian Marquardt

    (University Erlangen-Nürnberg
    Max Planck Institute for the Science of Light)

  • Anders S. Sørensen

    (University of Copenhagen
    University of Copenhagen)

Abstract

The fields of optomechanics and electromechanics have facilitated numerous advances in the areas of precision measurement and sensing, ultimately driving the studies of mechanical systems into the quantum regime. To date, however, the quantization of the mechanical motion and the associated quantum jumps between phonon states remains elusive. For optomechanical systems, the coupling to the environment was shown to make the detection of the mechanical mode occupation difficult, typically requiring the single-photon strong-coupling regime. Here, we propose and analyse an electromechanical setup, which allows us to overcome this limitation and resolve the energy levels of a mechanical oscillator. We found that the heating of the membrane, caused by the interaction with the environment and unwanted couplings, can be suppressed for carefully designed electromechanical systems. The results suggest that phonon number measurement is within reach for modern electromechanical setups.

Suggested Citation

  • Luca Dellantonio & Oleksandr Kyriienko & Florian Marquardt & Anders S. Sørensen, 2018. "Quantum nondemolition measurement of mechanical motion quanta," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-06070-y
    DOI: 10.1038/s41467-018-06070-y
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