A method for preparing any pure and wide class of mixed quantum states in the decoherence-free ground-state subspace of a degenerate multilevel lambda system, was proposed. The method is a combination of optical pumping and a series of coherent excitation processes. The method is robust with respect to the fluctuation of the pulse areas, as in adiabatic methods. The method is based on an excitation-relaxation process that derived the state of the system into the dark subspace of the Hamiltonian that governed the dynamics without decay processes.
ASJC Scopus subject areas
- Physics and Astronomy(all)