Experimental Demonstration of High-Dimensional Hyperentagled Quantum States

In this work we demonstrate experimentally the realization and characterization of high-dimensional hyperentangled quantum states of light in the time-energy and polarization degree of freedom. For this goal we use an ultra-bright Sagnac-type source to generate entangled photon in the telecommunication band by means of spontaneous parametric down-conversion (SPDC). To project the time-energy entanglement to a 4-dimensional space we implemented a 4-arm interferometer, consisting of a cascade array of 2-arm unbalanced Mach-Zehnder interferometers (UMZI). For the case of the projection of the entangled quantum states in the polarization degree of freedom (DoF) a compact, stable and robust polarization analysis module (PAM) was implemented to project polarization correlations in two non-orthogonal basis.