Rapid decoherence in integrable systems: a border effect.
We show that rapid decoherence, usually associated with chaotic dynamics, is not necessarily a hallmark of nonintegrability: border effects in integrable systems may produce similarly drastic decoherence rates. These can be found when the subsystem under observation possesses an energy limitation as, e.g., in the N-atom Jaynes-Cummings model. We show for this model that special initial coherent wave packets exhibit entropy production rates strikingly similar to the chaotic case. Also, a (de)localization phenomenon is found to be a function of the proximity to the phase-space border.
Angelo
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Instituto de Física "Gleb Wataghin," Universidade Estadual de Campinas, 13083-970 Campinas, SP, Brazil.
Furuya
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Nemes
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MC
Pellegrino
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GQ