Critical exponents in metastable decay via quantum activation

Abstract

We consider decay of metastable states of forced vibrations of a quantum oscillator close to bifurcation points, where dissipation becomes effectively strong. We show that decay occurs via quantum activation over an effective barrier. The decay probability $W$ scales with the distance $\eta$ to the bifurcation point as $|\ln W|\propto {\eta }^{\xi }$. The exponent $\xi$ is found for a resonantly driven oscillator and an oscillator modulated at nearly twice its eigenfrequency.

References in corpus (1)

• Switching via quantum activation: A parametrically modulated oscillator

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