Hong-Ou-Mandel interferometry and spectroscopy using entangled photons

Abstract Optical interferometry has been a long-standing setup for characterization of quantum states light. Both linear and the nonlinear interferences can provide information regarding light statistics underlying detail light-matter interactions. Here we demonstrate how interferometric detection spectroscopic signals may be used to improve measurement accuracy matter susceptibilities. Light-matter interactions change photon light, which are encoded in field correlation functions. Application is made Hong-Ou-Mandel two-photon interferometer that reveals entanglement-enhanced resolution achieved with existing optical technology.