40 citations · 278 across the 24 of their papers we have counts for
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quant-ph1998★ 24 cited
Unitary relations in time-dependent harmonic oscillators
Dae-Yup Song
For a harmonic oscillator with time-dependent (positive) mass and frequency, an unitary operator is shown to transform the quantum states of the system to those of a harmonic oscil…
quant-ph1998★ 40 cited
Exact quantum states of a general time-dependent quadratic system from classical action
Dae-Yup Song
A generalization of driven harmonic oscillator with time-dependent mass and frequency, by adding total time-derivative terms to the Lagrangian, is considered. The generalization wh…