Ivan Burbano Aldana (UCB) “Real-time Estimators for Scattering Observables: A full account of finite-volume errors for quantum simulation”

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Abstract: Lattice QCD is the only known systematically improvable tool we have for the determination of non-perturbative QCD observables from first principles. However, in its standard incarnation, the study of scattering observables beyond the three-particle energy threshold has been hindered by a number of challenges due to its Euclidean nature. In this talk I will give motivation for the lattice study of hadronic amplitudes, pinpoint the nature of the challenges Euclidean LQCD faces, and prove that quantum computers, by giving us direct access to real time evolution, can in principle lift these. To this end, I will explain the Real-time Estimators for Scattering Observables (RESOs) proposal, which is a completely generic methodology for the extraction of arbitrary scattering amplitudes at arbitrary energy regimes. The proof of this will rely on a simple representation of the finite-volume effects of generic Feynman diagrams. This talk is based on work done with Marco A. Carrillo, Rana Urek, Anthony N. Ciavarella and Raúl Briceño found in arXiv: 2506.06511.