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Quantum mechanics-free subsystem with mechanical oscillators

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

Science (American Association for the Advancement of Science), 2021-05, Vol.372 (6542), p.625-629 [Periódico revisado por pares]

United States: The American Association for the Advancement of Science

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  • Título:
    Quantum mechanics-free subsystem with mechanical oscillators
  • Autor: Mercier de Lépinay, Laure ; Ockeloen-Korppi, Caspar F ; Woolley, Matthew J ; Sillanpää, Mika A
  • Assuntos: Decibels ; Mechanical oscillators ; Oscillators ; Photons ; Physics ; Position measurement ; Quadratures ; Quantum entanglement ; Quantum mechanics ; Quantum physics ; Subsystems
  • É parte de: Science (American Association for the Advancement of Science), 2021-05, Vol.372 (6542), p.625-629
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 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.
  • Editor: United States: The American Association for the Advancement of Science
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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