Wu, SaijunTonyushkin, Alexey APrentiss, Mara2013-04-292009Wu, Saijun, Alexey Tonyushkin, and Mara G. Prentiss. 2009. Observation of saturation of fidelity decay with an atom interferometer. Physical Review Letters 103(34101).0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:10591648We use an atom interferometer to investigate the dynamics of matter waves in a periodically pulsed optical standing wave: an atom optics realization of the quantum kicked rotor that exhibits chaotic classical dynamics. We experimentally show that a measure of the coherence between the interferometer diffraction orders can revive after a quick initial loss, and can approach a finite asymptote as the number of kicks increases. This observation demonstrates that quantum fidelity of a classically chaotic system can survive strong perturbations over long times without decay.en-USJournal Article2013-04-2910.1103/PhysRevLett.103.034101