Experimental generation and characterization of single-photon hybrid ququarts based on polarization and orbital angular momentum encoding
Eleonora Nagali, Linda Sansoni, Lorenzo Marrucci, Enrico Santamato, Fabio Sciarrino · Physical Review A · 2010
High-dimensional quantum states, or qudits, represent a promising resource in the quantum information field. Here we present the experimental generation of four-dimensional quantum states, or ququarts, encoded in the polarization and orbital angular momentum of a single photon. Our technique, based on the $q$-plate device, allows the ququart to be prepared and measured in all five mutually unbiased bases. We report the reconstruction of the four-dimensional density matrix through the tomographic procedure for different ququart states.