We show that any pure, two-mode, N-photon state with N odd or equal to two can be transformed into an orthogonal state using only linear optics. According to a recently suggested definition of polarization degree, this implies that all such states are fully polarized. This is also found to be true for any pure, two-mode, energy eigenstate belonging to a two-dimensional SU(2) orbit. Complete two- and three-photon bases whose basis states are related by only phase shifts or geometrical rotations are also derived. " 2005 The American Physical Society.",,,,,,"10.1103/PhysRevA.71.033818",,,"http://hdl.handle.net/20.500.12104/44014","http://www.scopus.com/inward/record.url?eid=2-s2.0-18444398958&partnerID=40&md5=18516ed3a68403bf26617a6070afcc58",,,,,,"3",,"Physical Review A - Atomic, Molecular, and Optical Physics",,,,"71",,"Scopu
