https://doi.org/10.1140/epjc/s10052-025-14710-z
Letter
Quantum tomography beyond the leading order
Instituto de Física Teórica IFT-UAM/CSIC, c/Nicolás Cabrera 13–15, 28049, Madrid, Spain
Received:
15
July
2025
Accepted:
31
August
2025
Published online:
11
September
2025
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 
, which is of high interest for upcoming qutrit entanglement tests at the Large Hadron Collider.
© The Author(s) 2025
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Funded by SCOAP3.
