Experimental Demonstration of Self-Guided Quantum Tomography

TL;DR

This paper demonstrates an autonomous, efficient, and noise-robust quantum tomography method that accurately characterizes quantum states with fewer resources, suitable for current and near-future quantum experiments.

Contribution

It introduces and experimentally validates self-guided quantum tomography, a novel autonomous technique that improves robustness and efficiency over traditional methods.

Findings

Robust against statistical noise and experimental errors

Effective for single and entangled two-qubit states

Requires less computational resources than standard techniques

Abstract

Robust, accurate and efficient quantum tomography is key for future quantum technologies. Traditional methods are impractical for even medium sized systems and are not robust against noise and errors. Here we report on an experimental demonstration of self-guided quantum tomography; an autonomous, fast, robust and precise technique for measuring quantum states with significantly less computational resources than standard techniques. The quantum state is iteratively learned by treating tomography as a projection measurement optimization problem. We experimentally demonstrate robustness against both statistical noise and experimental errors on both single qubit and entangled two-qubit states. Our demonstration provides a method of full quantum state characterization in current and near-future experiments where standard techniques are unfeasible.