Orthogonality of biphoton polarization states
Maria V. Chekhova, Leonid A. Krivitsky, S. P. Kulik, Gleb Maslennikov · Physical Review A · 2004
Orthogonality of two-photon polarization states belonging to a single frequency and spatial mode is demonstrated experimentally, in a generalization of the well-known anticorrelation ``dip'' experiment.