Quantum back-action evading measurement of collective mechanical modes

ORAL

Abstract

The standard quantum limit constrains the precision of an oscillator position measurement. It arises from a balance between the imprecision and the quantum back-action of the measurement. However, a measurement of only a single quadrature of the oscillator can evade the back-action and be made with arbitrary precision. Quantum back-action evading measurements of a collective quadrature of two mechanical oscillators, both coupled to a common microwave cavity, have been demonstrated. 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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Authors

  • Matt Woolley

    • UNSW Canberra

  • Caspar Ockeloen-Korppi

    • Aalto University

  • Erno Damskagg

    • Aalto University

  • Juha Pirkkalainen

    • Aalto University

  • Aash Clerk

    • Department of physics, McGill University
    • McGill Univ
    • McGill University
    • McGill University, Montreal, Quebec, Canada.
    • Department of Physics, McGill University, 3600 Rue University, Montreal, Quebec H3A 2T8, Canada.

  • Mika Sillanpaa

    • Aalto University