Unambiguous modification of nonorthogonal single- and two-photon polarization states
Fabian A. Torres-Ruiz, J.F. Aguirre, A. Delgado, Gislayne Karen dos Santos Lima, Leonardo Neves, Sebastião Pádua, Luis Roa, C. Saavedra · Physical Review A · 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.