Quantum mechanics-free subsystem with mechanical oscillators

Laure Mercier de Lépinay, Caspar F. Ockeloen-Korppi, Matthew J. Woolley, Mika A. Sillanpää

Research output: Contribution to journalArticleScientificpeer-review

108 Citations (Scopus)

Abstract

Quantum mechanics sets a limit for the precision of continuous measurement of the position of an oscillator. We show how it is possible to measure an oscillator without quantum back-action of the measurement by constructing one effective oscillator from two physical oscillators. We realize such a quantum mechanics-free subsystem using two micromechanical oscillators, and show the measurements of two collective quadratures while evading the quantum back-action by 8 decibels on both of them, obtaining a total noise within a factor of 2 of the full quantum limit. This facilitates the detection of weak forces and the generation and measurement of nonclassical motional states of the oscillators. Moreover, we directly verify the quantum entanglement of the two oscillators by measuring the Duan quantity 1.4 decibels below the separability bound.

Original languageEnglish
Pages (from-to)625-629
Number of pages23
JournalScience (New York, N.Y.)
Volume372
Issue number6542
DOIs
Publication statusPublished - 7 May 2021
MoE publication typeA1 Journal article-refereed

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  • -: European Microkelvin Platform

    Hakonen, P. (Principal investigator)

    01/01/201931/12/2023

    Project: EU: Framework programmes funding

  • Quantum squeezing and entanglement in microwave optomechanical systems

    Ockeloen-Korppi, C. (Principal investigator)

    01/09/201731/08/2020

    Project: Academy of Finland: Other research funding

  • Quantum mechanics of mechanics

    Sillanpää, M. (Principal investigator), Wang, C. (Project Member), Damskägg, E. (Project Member), Mercier de Lepinay, L. (Project Member), Mishra, H. (Project Member), Liu, Y. (Project Member), Välimaa, A. (Project Member) & Rej, E. (Project Member)

    01/09/201731/08/2021

    Project: Academy of Finland: Other research funding

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