Quantum State Tomography of Photonic Qubits with Realistic Coherent Light Sources

TL;DR

This paper develops a numerical framework to evaluate quantum state tomography of photonic qubits in realistic noisy environments, highlighting how classical signal power impacts the accuracy and efficiency of state reconstruction.

Contribution

It introduces a simulation method to assess QST performance under practical conditions with noise and classical signals, offering insights for improving quantum state characterization.

Findings

QST efficiency decreases with increased classical signal power.

Fidelity of reconstructed states is sensitive to shot noise and Raman scattering.

Potential pathways for enhancing QST robustness in fiber-optic quantum communication.

Abstract

Quantum state tomography (QST) is an essential technique for characterizing quantum states. However, practical implementations of QST are significantly challenged by factors such as shot noise, attenuation, and Raman scattering, especially when photonic qubits are transmitted through optical fibers alongside classical signals. In this paper, we present a numerical framework to simulate and evaluate the efficiency of QST under these realistic conditions. The results reveal how the efficiency of QST is influenced by the power of the classical signal. By analyzing the fidelity of reconstructed states, we provide insights into the limitations and potential improvements for QST in noisy environments.