Abstract
Control of population transfer by rapid adiabatic passage has been an estab- lished technique wherein the exact amplitude proflle of the shaped pulse is considered to be insigniflcant. We study the efiect of ultrafast shaped pulses for two-level systems, by density-matrix approach. However, we flnd that adiabaticity depends simultaneously on pulse proflle as well as the frequency modulation under non-resonant conditions.
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