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- W2035067317 abstract "We describe the temporal behavior of the dynamic elements of an exactly soluble quantum model. The model consists of a single two-level atom or spin interacting with a single mode of the quantized radiation field in the dipole approximation, the mode being initially in an arbitrary coherent state of excitation. We give new long-time numerical and closed-form approximate analytic solutions for the expectation values of the atomic dipole moment and the difference in population of the two atomic levels in the rotating wave approximation. The atomic dipole-dipole correlation function is calculated. All of the results are obtained without semiclassical or decorrelation approximations. Unusual features found in the temporal behavior of this lossless model problem are collapse, i.e., episodic nonexponential damping of both the atomic inversion and dipole moment, and two kinds of revival or partial recorrelation, in the dynamic evolution, during which the initial state is nearly recovered. We give analytic formulas for the collapse function, for both of the revival times, and for the envelope of the revival maxima. Some remarks are made about the nature of irreversibility in this exactly soluble and loss-free model." @default.
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- W2035067317 date "1981-01-01" @default.
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- W2035067317 title "Coherence versus incoherence: Collapse and revival in a simple quantum model" @default.
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- W2035067317 doi "https://doi.org/10.1103/physreva.23.236" @default.
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