  In a two level atom, real-time quantum state holography is performed through
interferences between quantum states created by a reference pulse and a chirped
pulse resulting in coherent transients. A sequence of several measurements
allows one to measure the real and imaginary parts of the excited state wave
function. These measurements are performed during the interaction with the
ultrashort laser pulse. The extreme sensitivity of this method to the pulse
shape provides a tool for electric field measurement.
