Resource-efficient quantum correlation measurements via multicopy neural network methods.

ABSTRACT: Measuring complex properties in quantum systems, such as measures of quantum entanglement and Bell nonlocality, is inherently challenging. Traditional methods, like quantum state tomography (QST), require a full reconstruction of the density matrix for a given system and demand resources that scale exponentially with system size. We propose an alternative strategy that reduces the required information by combining multicopy measurements with artificial neural networks (ANNs), resulting in a 67% reduction in measurement requirements compared to QST. We have successfully measured two-qubit quantum correlations of Bell states subjected to a depolarizing channel (resulting in Werner states) and an amplitude-damping channel (leading to Horodecki states) using the multicopy approach on real quan

SUBMITTER: Tulewicz P 

PROVIDER: S-EPMC12630988 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature