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High-dimensional quantum states, or qudits, represent a promising resource inthe quantum information field. Here we present the experimental generation offour-dimensional quantum states, or ququarts, encoded in the polarization andorbital angular momentum of a single photon. Our novel technique, based on theq-plate device, allows to prepare and measure the ququart in all five mutuallyunbiased bases. We report the reconstruction of the four dimensional densitymatrix through the tomographic procedure for different ququart states.

Experimental generation and characterization of single-photon hybrid ququarts based on polarization-orbital angular momentum encoding