Subharmonic Generation in Quantum Systems

Abstract

We show how the classical-quantum correspondence permits long-lived subharmonic motion in a quantum system driven by a periodic force. Exponentially small deviations from exact subharmonicity are due to coherent tunneling between quantized vortex tubes which surround classical elliptic periodic orbits.

11 pages + 5 figures (available upon request), Revtex 3.0, NSF-ITP-93-43

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