Anti-Flatness and Non-Local Magic in Two-Particle Scattering Processes

TL;DR

This paper investigates non-local magic and anti-flatness in two-particle scattering, revealing their relationship and potential for experimental measurement, thereby advancing understanding of quantum complexity in fundamental interactions.

Contribution

It demonstrates that non-local magic is four times the anti-flatness in two-particle scattering and explores their relation, highlighting anti-flatness as an experimentally accessible measure.

Findings

Non-local magic is four times anti-flatness in studied processes.

Anti-flatness can be determined from one final-state particle without spin correlations.

Results suggest anti-flatness as a practical measure for quantum complexity in experiments.

Abstract

Non-local magic and anti-flatness provide a measure of the quantum complexity in the wavefunction of a physical system. Supported by entanglement, they cannot be removed by local unitary operations, thus providing basis-independent measures, and sufficiently large values underpin the need for quantum computers in order to perform precise simulations of the system at scale. Towards a better understanding of the quantum-complexity generation by fundamental interactions, the building blocks of many-body systems, we consider non-local magic and anti-flatness in two-particle scattering processes, specifically focusing on low-energy nucleon-nucleon scattering and high-energy Moller scattering. We find that the non-local magic induced in both interactions is four times the anti-flatness (which is found to be true for any two-qubit wavefunction), and verify the relation between the Clifford-averaged anti-flatness and total magic. For these processes, the anti-flatness is a more experimentally accessible quantity as it can be determined from one of the final-state particles, and does not require spin correlations. While the MOLLER experiment at the Thomas Jefferson National Accelerator Facility does not include final-state spin measurements, the results presented here may add motivation to consider their future inclusion.