Fidelity of the quantum delta-kicked accelerator
  The sensitivity of the fidelity in the kicked rotor to an acceleration is experimentally and theoretically investigated. We used a Bose-Einstein condensate exposed to a sequence of pulses from a standing light wave followed by a single reversal pulse in which the standing wave was shifted by half a wavelength. The features of the fidelity "spectrum" as a function of acceleration are presented. This work may find application in the measurement of temperature of an atomic sample. 
R. K. Shrestha, S. Wimberger, J. Ni, W. K. Lam, and G. S. Summy
quant-ph