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Optically probing Schwinger angular momenta in a micromechanical resonator

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posted on 2023-11-30, 18:30 authored by Motoki Asano, Ryuichi Ohta, Takuma Aihara, Tai Tsuchizawa, Hajime Okamoto, Hiroshi Yamaguchi
We report an observation of phononic Schwinger angular momenta, which fully represent twomode states in a micromechanical resonator. This observation is based on simultaneous optical detection of the mechanical response at the sum and difference frequency of the two mechanical modes. A post-selection process for the measured signals allows us to extract a component of phononic Schwinger angular momenta. It also enables us to conditionally prepare two-mode squeezed (correlated) states from a randomly excited (uncorrelated) state. The phononic Schwinger angular momenta could be extended to high-dimensional symmetry (e.g. SU(N) group) for studying multipartite correlations in non-equilibrium dynamics with macroscopic objects.

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