F. A. Torres-Ruiz, G. Lima, L. Neves, J.G. Aguirre-Goméz, A. Delgado, L. Roa, S. Pádua and C. Saavedra
PHYSICAL REVIEW A 79 (2009)
In this paper we propose a probabilistic method which allows an unambiguous modification of two nonorthogonal quantum states. We experimentally implement this protocol by using two-photon polarization states generated in the process of spontaneous parametric down conversion. In the experiment, for codifying initial quantum states, we consider single-photon states and heralded detection. We show that the application of this protocol to entangled states allows a fine control of the amount of entanglement of the initial state.