  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.
