Quantum Backaction Evading Measurement of Collective Mechanical Modes

C. F. Ockeloen-Korppi, E. Damskägg, J.-M. Pirkkalainen, A. A. Clerk, M. J. Woolley, and M. A. Sillanpää
Phys. Rev. Lett. 117, 140401 – Published 26 September 2016
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Abstract

The standard quantum limit constrains the precision of an oscillator position measurement. It arises from a balance between the imprecision and the quantum backaction of the measurement. However, a measurement of only a single quadrature of the oscillator can evade the backaction and be made with arbitrary precision. Here we demonstrate quantum backaction evading measurements of a collective quadrature of two mechanical oscillators, both coupled to a common microwave cavity. The work allows for quantum state tomography of two mechanical oscillators, and provides a foundation for macroscopic mechanical entanglement and force sensing beyond conventional quantum limits.

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  • Received 8 July 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.140401

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsGeneral PhysicsQuantum Information, Science & Technology

Authors & Affiliations

C. F. Ockeloen-Korppi1, E. Damskägg1, J.-M. Pirkkalainen1, A. A. Clerk2, M. J. Woolley3, and M. A. Sillanpää1,*

  • 1Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 AALTO, Finland
  • 2Department of Physics, McGill University, 3600 rue University, Montréal, Quebec H3A 2T8, Canada
  • 3School of Engineering and Information Technology, UNSW Canberra, Australian Capital Territory 2600, Australia

  • *mika.sillanpaa@aalto.fi

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Issue

Vol. 117, Iss. 14 — 30 September 2016

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