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Observations of the collapse and fractional revival of a Rydberg wavepacket in atomic rubidium

The authors have excited and detected a radially localized electronic wavepacket in atomic rubidium. The wavepacket is formed of an optically induced coherent superposition of Rydberg states with mean principal quantum number, n=62. The motion of the wavepacket on a classical trajectory is monitored in a time-delayed ionization experiment. The collapse and revival of the classical dynamics is observed. During the period of nonclassical behaviour they observe, for the first time, a partial revival of the wavepacket.