Phonon counting thermometry of an ultracoherent membrane resonator near its motional ground state

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The generation of non-Gaussian quantum states of macroscopic mechanical objects is key to a number of challenges in quantum information science, ranging from fundamental tests of decoherence to quantum communication and sensing. Heralded generation of single-phonon states of mechanical motion is an attractive way toward this goal, as it is, in principle, not limited by the object size. Here we demonstrate a technique that allows for generation and detection of a quantum state of motion by phonon counting measurements near the ground state of a 1.5 MHz micromechanical oscillator. We detect scattered photons from a membrane-in-the-middle optomechanical system using an ultra-narrowband optical filter, and perform Raman-ratio thermometry and second-order intensity interferometry near the motional ground state ((n) over bar = 0.23 +/- 0.02 phonons). With an effective mass in the nanogram range, our system lends itself for studies of long-lived non-Gaussian motional states with some of the heaviest objects to date. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Udgave nummer6
Sider (fra-til)718-725
Antal sider8
StatusUdgivet - 20 jun. 2020

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