abstract:In quantum mechanics, a doublet is a quantum state of a system with a spin of 1/2, such that there are two allowed values of the spin component, −1/2 and +1/2. Quantum systems with two possible states are sometimes called two-level systems.
We demonstrate that the maximumcoherentsuperpositionstatecan beselectivelypreparedusing a sequenceofpulsepairs in lambda-type atomic systems, with the final level as a doublet.