Eigenvalues and eigenfunctions Phase space methods Quantum theory Open quantum systems Periodic orbits Quantum electronics Quantum optics Approximation theory Asymptotic analysis Asymptotic properties Boundary conditions Chaos theory Chaotic cavities Chaotic systems Coherent light Computer Simulation Current behaviors Decay (organic) Decoherence Diffraction Diffraction effects Directed transport Eigen function Eigen values Eigenstates Eigenvalue distributions Evolution operator Evolution operators Hilbert space Initial conditions