Parametrically driven oscillators with added noise: heating and thermal squeezing

Abstract

Here we report a theoretical model based on Green's functions, Floquet theory, and averaging techniques up to second order that describes the dynamics of parametrically driven oscillators with added thermal noise. Quantitative estimates for heating and quadrature thermal noise squeezing near and below the transition line of the rst parametric instability zone of the oscillator are given. Furthermore, we give an intuitive explanation as to why heating and thermal squeezing occur. Finally, we validate our analytical estimates of thermal uctuations by verifying them numerically. Very good agreement is achieved between the two approaches.