In general, decoherence destroys quantum-mechanical interference originatin
g from the coherent superposition of complex probability amplitudes. In thi
s paper we show how decoherence of a quantized electromagnetic field inside
a cavity influences atomic motion. This motion is entangled with the inter
nal states of the atom and with the quantized field via the Jaynes-Cummings
interaction. As a result, we present the effect of generating coherence in
the subspace of the atomic motion via decoherence of the cavity field. The
quantum trajectory method is used for the description of the relaxation pr
ocess.