Effect of three-level atomic state coherence on collapse and revival dynamics

For a three-level atom with two excited states each dipole-coupled to a common ground state, the authors have found a particular linear combination of the atomic states which will not experience Rabi oscillations and their associated collapses and revivals. If the atom is initially prepared in this combination state, the atomic population will be coherently trapped there, and the dynamical behaviour will be constant in time.