Dark Modes of Quantum Linear Systems
  In this paper, we develop a direct method for the characterization of dark modes. The results can be used to construct a transformation that separates dark and bright modes, through the decomposition of system dynamics. We also study a synthesis problem by engineering the system-environment coupling and Hamiltonian engineering. We apply the theory to investigate an optomechanical dark mode. 
Yu Pan, Daoyi Dong and Ian R. Petersen
quant-ph