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THU: Thursday Contributed Sessions

THU 10: Foundational / Mathematical Aspects – Methods and Approximations

THU 10.1: Talk

Thursday, September 11, 2025, 14:15–14:30, ZHG103

Shadow tomography for relativistic scattering experiments — Chau Nguyen, •Matthias Kleinmann, Otfried Gühne, Carmen Diez Pardos, and Gilberto Tetlalmatzi-Xolocotzi — University of Siegen, Germany

Scattering experiments produce relativistic particles that carry besides momentum information also spin, where the spin information of a decaying particle is accessible via the momenta of the decay particles. However, associating a consistent spin state to the particle proves to be difficult: In particular in the relativistic setting the spin state strongly depends on the reference frame, and with it, for example, change its purity and entanglement properties. This is further aggravated by the fact that each decaying particle has different momentum. We show that techniques from shadow tomography are best suited to handle this situation and that this can be used to infer a meaningful notion of entanglement, test the validity of the underlying physical model, and to extract information that can be otherwise difficult to access, like the ratio between different production channels.

Keywords: quantun state tomography; particle physics; entanglement theory