Non-classical correlations between photons and phonons of center-of-mass motion of a mechanical oscillator

• URL: http://arxiv.org/abs/2312.05641v2
• Date: Wed, 14 Aug 2024 22:01:53 GMT
• Title: Non-classical correlations between photons and phonons of center-of-mass motion of a mechanical oscillator
• Authors: Ivan Galinskiy, Georg Enzian, Michał Parniak, Eugene Polzik,
• Abstract summary: We show non-classical correlations between phonons and photons created using opto-mechanical spontaneous parametric down-conversion. We observe a violation of the classical two-time Cauchy-Schwarz inequality between a heralding write photon and a stored phonon with a confidence of $>92%$.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We demonstrate non-classical correlations between phonons and photons created using opto-mechanical spontaneous parametric down-conversion in a system based on a soft-clamped ultracoherent membrane oscillator inside of a Fabry-P\'erot optical resonator. Non-Gaussian quantum features are demonstrated for the center-of-mass motion of a sub-millimeter nanogram-scale mechanical oscillator. We show that phonons stored in the mechanical oscillator, when subsequently read out, display strong signs of quantum coherence, which we demonstrate by single-photon counting enabled by our state-of-the-art optical filtering system. We observe a violation of the classical two-time Cauchy-Schwarz inequality between a heralding write photon and a stored phonon with a confidence of $>92\%$.

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