Ultra-short strong excitation of two-level systems
Pankaj K. Jhaa
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We present a model describing the use of ultra-short strong pulses to control the population of the excited level of a two-level quantum system. In particular, we study an off-resonance excitation with a fewcycles pulse which presents a smooth phase jump i.e. a change of the pulse's phase which is not steplike, but happens over a ﬁnite time interval. A numerical solution is given for the time-dependent probabilityamplitude of the excited level. The control of the excited level's population is obtained acting on the shape of the phase transient, and other parameters of the excitation pulse.