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- W4283447495 abstract "We propose a definition of the asymptotic phase for quantum nonlinear oscillators from the viewpoint of the Koopman operator theory. The asymptotic phase is a fundamental quantity for the analysis of classical limit-cycle oscillators, but it has not been defined explicitly for quantum nonlinear oscillators. In this study, we define the asymptotic phase for quantum oscillatory systems by using the eigenoperator of the backward Liouville operator associated with the fundamental oscillation frequency. By using the quantum van der Pol oscillator with a Kerr effect as an example, we illustrate that the proposed asymptotic phase appropriately yields isochronous phase values in both semiclassical and strong quantum regimes." @default.
- W4283447495 created "2022-06-26" @default.
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- W4283447495 date "2022-06-01" @default.
- W4283447495 modified "2023-10-03" @default.
- W4283447495 title "A definition of the asymptotic phase for quantum nonlinear oscillators from the Koopman operator viewpoint" @default.
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- W4283447495 doi "https://doi.org/10.1063/5.0088559" @default.
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