Quantum Backaction Evading Measurement of Collective Mechanical Modes

C. F. Ockeloen-Korppi, Erno Damskägg, J. -M. Pirkkalainen, A. A. Clerk, M. J. Woolley, Mika Sillanpää

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Article number140401
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Letters
Volume117
Issue number14
DOIs
Publication statusPublished - 26 Sep 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • NANOMECHANICAL MOTION
  • CAVITY OPTOMECHANICS
  • NOISE
  • OSCILLATOR
  • SCHEME
  • STATE
  • LIMIT

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