Correcting detection error in quantum computation and state engineering through data processing

TL;DR

This paper introduces a data processing method to correct quantum detection errors, simplifying experimental requirements and improving accuracy in quantum state detection and entanglement verification.

Contribution

A novel, experimentally feasible data processing approach for correcting detection errors in quantum experiments, reducing the need for complex quantum error correction.

Findings

Effective correction of detection errors demonstrated

Applicable to multipartite entanglement detection

Calibrated error correction across various error magnitudes

Abstract

Quantum error correction in general is experimentally challenging as it requires significant expansion of the size of quantum circuits and accurate performance of quantum gates to fulfill the error threshold requirement. Here we propose a method much simpler for experimental implementation to correct arbitrary detection errors. The method is based on processing of data from repetitive experiments and can correct detection error of any magnitude, as long as the error magnitude is calibrated. The method is illustrated with its application to detection of multipartite entanglement from quantum state engineering.