Dynamical tunneling in macroscopic systems

Abstract

We investigate macroscopic dynamical quantum tunneling (MDQT) in the driven Duffing oscillator, charateristic for Josephson junction physics and nanomechanics. Under resonant conditions between stable coexisting states of such systems we calculate the tunneling rate. In macroscopic systems coupled to a heat bath, MDQT can be masked by driving-induced activation. We compare both processes, identify conditions under which tunneling can be detected with present day experimental means and suggest a protocol for its observation.

4 pages, 3 figures

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• Noise-enabled precision measurements of a Duffing nanomechanical resonator
• Dispersive measurements of superconducting qubit coherence with a fast, latching readout
• Switching via quantum activation: A parametrically modulated oscillator
• Noise Squeezing in a Nanomechanical Duffing Resonator
• High-contrast dispersive readout of a superconducting flux qubit using a nonlinear resonator
• Critical exponents in metastable decay via quantum activation
• Quantum interference in the classically forbidden region: a parametric oscillator
• Nonlinear response of a driven vibrating nanobeam in the quantum regime
• Dynamics of the quantum Duffing oscillator in the driving induced bistable regime
• Nonlinear resonant behavior of the dispersive readout scheme for a superconducting flux qubit

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