The Quantum Optics Laboratory at the University of Maryland, Baltimore County was established in the fall of 1989.  This laboratory has been recognized as one of the leading groups in the field of quantum optics that attempts to probe the fundamental problems of physics. The research on multi-photon entanglement, multi-photon interferometry and coherence, especially on quantum imaging has inspired a great deal of interests in the physics and engineering community. A number of conferences and workshops have been organized and held at UMBC since 1989.  In the past ten years, this group has published more then one hundred papers in leading refereed journals and given more then one hundred invited presentations in national and international professional conferences and workshops.  The following links include review papers in experiment and in theory that summarize the research activities of the group.