Abstract
Quantum effects are considered in the dynamics of a system of N paramagnetic atoms in a resonant cavity interacting with a constant magnetic field and with a resonant external magnetic field. In the semi-classical limit (classical radiation field in the cavity) this resonantly driven system shows developed (global) chaos. Expectation-value dynamics shows however that quantum corrections cause a departure from the semi-classical chaotic dynamics on a time-scale τ ℏ∼ln N and that quantum correlation functions grow exponentially in time. The possibility of experimentally observing this effect is discussed.
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