Experimental Realization of Optimal Noise Estimation for a General Pauli Channel

TL;DR

This paper demonstrates an experimental method for optimally estimating noise in a Pauli channel using Bell states, outperforming traditional quantum process tomography.

Contribution

It introduces an experimental protocol for optimal noise estimation in Pauli channels using Bell states and Bell measurements, showing improved efficiency.

Findings

Optimal estimation protocol outperforms quantum process tomography

Bell measurement achieves higher efficiency in noise estimation

Experimental setup successfully implements the theoretical method

Abstract

We present the experimental realization of the optimal estimation protocol for a Pauli noisy channel. The method is based on the generation of 2-qubit Bell states and the introduction of quantum noise in a controlled way on one of the state subsystems. The efficiency of the optimal estimation, achieved by a Bell measurement, is shown to outperform quantum process tomography.