High-dimensional quantum channel estimation using classical light

TL;DR

This paper introduces a method for high-dimensional quantum channel estimation using classical light, leveraging a single nonseparable optical field and sum frequency generation for measurements.

Contribution

It presents a novel approach combining classical light and nonlinear optical processes to efficiently characterize high-dimensional quantum channels.

Findings

Successfully estimates quantum channels using classical light.

Utilizes correlations in spatial modes and wavelength for channel characterization.

Employs sum frequency generation for measurement implementation.

Abstract

A method is proposed to characterize a high-dimensional quantum channel with the aid of classical light. It uses a single nonseparable input optical field that contains correlations between spatial modes and wavelength to determine the effect of the channel on the spatial degrees of freedom. The channel estimation process incorporates spontaneous parametric upconversion (sum frequency generation) to perform the necessary measurements.