Physics – Quantum Physics
Scientific paper
2010-03-16
Journal of Russian Laser Research, vol. 31, issue 2, pp. 152-161 (2010)
Physics
Quantum Physics
9 pages, typos corrected, corresponds to the published version, except for the reference style
Scientific paper
10.1007/s10946-010-9134-6
A "microscopic" justification of the "symmetric damping" model of a quantum oscillator with time-dependent frequency and time-dependent damping is given. This model is used to predict results of experiments on simulating the dynamical Casimir effect in a cavity with a photo-excited semiconductor mirror. It is shown that the most general bilinear time-dependent coupling of a selected oscillator (field mode) to a bath of harmonic oscillators results in two equal friction coefficients for the both quadratures, provided all the coupling coefficients are proportional to a single arbitrary function of time whose duration is much shorter than the periods of all oscillators. The choice of coupling in the rotating wave approximation form leads to the "mimimum noise" model of the quantum damped oscillator, introduced earlier in a pure phenomenological way.
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