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This is a Quantitative Study study.

September 16, 2025Open Access

Quantum tomography beyond the leading order

Key Points

Higher-order corrections in quantum tomography can be treated as background effects, ensuring more accurate data analysis.
This method is illustrated through the case of Higgs decays, enhancing our understanding of quantum mechanics.
The approach integrates advanced modeling techniques to separate meaningful data from background noise.
The findings have significant implications for future experiments on qutrit entanglement, particularly at large particle colliders.

Abstract

Abstract Quantum tomography, as a tool to probe foundational aspects of quantum mechanics, relies on extracting spin information from angular distributions. This is inherently a leading-order technique, ill-defined when higher-order corrections are significant. For those cases, we propose to treat higher-order corrections as a background, to be modeled and subtracted from data in the same way as other backgrounds are. We illustrate this procedure for Higgs decays H ZZ e^+ e^- ^+ ^- H → Z Z → e + e - μ + μ -, which is of high interest for upcoming qutrit entanglement tests at the Large Hadron Collider.

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