Interferometric Imaging of Amplitude and Phase of Spatial Biphoton States

By Danilo Zia et al

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Table of Contents

I. Introduction
II. Theory Background
III. Experimental Setup and Results

Summary

This document discusses the interferometric imaging of spatial biphoton states, focusing on high-dimensional biphoton states and their applications in quantum technologies. The authors introduce biphoton digital holography as a method for quantum state tomography, enabling more efficient and reliable characterization of states in arbitrary spatial modes bases. The document details the theoretical background, the experimental setup involving off-axis digital holography, and the results obtained from reconstructing biphoton states emitted via spontaneous parametric down-conversion in a nonlinear crystal. The experimental findings include correlations in degrees of freedom such as orbital angular momentum and radial modes, showcasing the potential for high-dimensional quantum applications.