  We discuss the use of incoherent light as a resource to control the atomic
dynamics and review the proposed in Phys. Rev. A 84, 042106 (2011) method for a
controlled transfer between any pure and mixed states of quantum systems using
a combination of incoherent and coherent light. Formally, the method provides a
constructive proof for an approximate open-loop Markovian state-transfer
controllability of quantum system in the space of all density matrices---the
strongest possible degree of quantum state control.
