Abstract
We study a non-stationary electronic wave packet in a quantizedelectromagnetic field. Generally, the electron and field becomeentangled as the electronic wave packet evolves. Here we find that,when the initial photon state is a coherent one, the wavefunction ofthe system can be factorized if we neglect the transferred photonnumber. In this case, the quantized-field calculation is equivalent tothe semi-classical calculation.
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