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

Abstract:Non-local non-stabilizerness 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 non-stabilizerness 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 non-stabilizerness 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 non-stabilizerness. 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.

arXiv:2510.23426 [quant-ph]

(or arXiv:2510.23426v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2510.23426 Focus to learn more arXiv-issued DOI via DataCite

Phys. Rev. D 114, 014007 (2026)

https://doi.org/10.1103/hvft-hk9p Focus to learn more DOI(s) linking to related resources

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