other hand, with (only) linear-optical devices and post-selection of specific outcomes plus a feed-forward process, it can be applied with high success probability, and be used for obtaining universal linear-optical quantum computing, as done in the KLM model. See also Optics Quantum optics Nonlinear optics Linear optical quantum computing (LOQC) KLM model for LOQC Optical phase space Optical physics Nonclassical light Optics