Probing the State of a Mechanical Oscillator with an Ultrastrongly Coupled Quantum Emitter

Cyril Elouard, Benjamin Besga, and Alexia Auffèves
Phys. Rev. Lett. 122, 013602 – Published 9 January 2019
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Abstract

Performing accurate position measurements of a mechanical resonator by coupling it to some optically driven quantum emitter is an important challenge for quantum sensing and metrology. We fully characterize the quantum noise associated with this measurement process, by deriving master equations for the coupled emitter and the resonator valid in the ultrastrong coupling regime. At short timescales, we show that this noise sets a fundamental limit to the readout sensitivity and that the standard quantum limit can be recovered for realistic experimental conditions. At long timescales, the scattering of the mechanical quadratures leads to the decoupling of the emitter from the driving light, switching off the noise source. This method can be used to describe the interaction of any quantum system strongly coupled to a finite size reservoir.

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  • Received 19 July 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.013602

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Cyril Elouard1,*, Benjamin Besga2,†, and Alexia Auffèves3,‡

  • 1Department of Physics and Astronomy and Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA
  • 2Université de Lyon, CNRS, Laboratoire de Physique de l’École Normale Supérieure, UMR5672, 46 Allée d’Italie, 69364 Lyon, France
  • 3Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France

  • *celouard@ur.rochester.edu
  • benjamin.besga@ens-lyon.fr
  • alexia.auffeves@neel.cnrs.fr

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Issue

Vol. 122, Iss. 1 — 11 January 2019

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