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oai:recercat.cat:2117/3436352026-01-23T08:13:03Zcom_2072_1033col_2072_452950

Determining the proton content with a quantum computer Pérez Salinas, Adrián Cruz Martinez, Juan Alhajri, Abdulla A. Carrazza, Stefano Barcelona Supercomputing Center Àrees temàtiques de la UPC::Física Quantum computers Quantum mechanics High energy physics Quantum Information Quantum computer Machine learning Measurement-based quantum computing Particle interactions Perturbative QCD Quantum algorithms Quantum chromodynamics Quantum simulations Ordinadors quàntics Protons We present a first attempt to design a quantum circuit for the determination of the parton content of the proton through the estimation of parton distribution functions (PDFs), in the context of high energy physics (HEP). The growing interest in quantum computing and the recent developments of new algorithms and quantum hardware devices motivates the study of methodologies applied to HEP. In this work we identify architectures of variational quantum circuits suitable for PDFs representation (qPDFs). We show experiments about the deployment of qPDFs on real quantum devices, taking into consideration current experimental limitations. Finally, we perform a global qPDF determination from collider data using quantum computer simulation on classical hardware and we compare the obtained partons and related phenomenological predictions involving hadronic processes to modern PDFs. We thank José Ignacio Latorre, Sergi Ramos-Calderer, Carlos Bravo-Prieto and Diego García-Martín for useful and insightful discussions. A. P. S. is supported by Spanish Government, Ministerio de Ciencia e Innovación, PGC2018-095862-B-C22, Secretaria d’Universitats iRecerca del Departament d’Empresa i Coneixement dela Generalitat de Catalunya, co-funded by the EuropeanUnion Regional Development Fund within the ERDFOperational Program of Catalunya, Quantum-Cat, ref. 001-P-001644. A. P. S. acknowledges CaixaBank for its support of this work through Barcelona Supercomputing Center’s project CaixaBank Computación Cuántica. J. C. M. and S. C. are supported by the European Research Council under the European Union’s Horizon 2020 research and innovation Programme (Grant agreement No. 740006). This work is supported by the Quantum Research Centre at the Technology Innovation Institute. Peer Reviewed Postprint (published version) 2021-02 Article Pérez Salinas, A. [et al.]. Determining the proton content with a quantum computer. "Physical Review D", Febrer 2021, vol. 103, núm. 3, 034027. 2470-0029 https://hdl.handle.net/2117/343635 10.1103/PhysRevD.103.034027 eng https://link.aps.org/doi/10.1103/PhysRevD.103.034027 http://creativecommons.org/licenses/by/3.0/es/ https://creativecommons.org/licenses/by/4.0/ Open Access Attribution 3.0 Spain Attribution 4.0 International (CC BY 4.0) 14 p. application/pdf American Physical Society