# Robust spectral phase reconstruction of time-frequency entangled bi-photon states

## TL;DR

This paper introduces a new method using the MICE algorithm for robustly reconstructing the joint spectral phase of time-frequency entangled photon pairs, crucial for advancing quantum optical technologies.

## Contribution

It presents a novel multi-shear spectral phase reconstruction scheme based on the MICE algorithm, suitable for noisy environments, with simulation results and an experimental proposal.

## Key findings

- Successful simulation of phase reconstruction
- Proposed experimental setup with a Franson interferometer
- Enhanced robustness in noisy conditions

## Abstract

Exploitation of time-frequency properties of SPDC photon pairs has recently found application in many endeavors. Complete characterization and control over the states in this degree of freedom is of paramount importance for the development of optical quantum technologies. This is achieved by accessing information both on the joint spectral amplitude and the joint spectral phase. Here we propose a novel scheme based on the MICE algorithm, which aims at reconstructing the joint spectral phase by adopting a multi-shear approach, making the technique suitable for noisy environments. We report on simulations for the phase reconstruction and propose an experiment using a Franson modified interferometer.