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No-cost Bell nonlocality certification from quantum tomography and its applications in quantum-magic-resource witnessing

Paweł Cieśliński1,2, Lukas Knips3,4,5, Harald Weinfurter3,4,5, and Wiesław Laskowski1

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Phys. Rev. A 113, 052404 – Published 1 May, 2026

DOI: https://doi.org/10.1103/1nkl-sphd

Abstract

Tomographic measurements are the standard tool for characterizing quantum states, yet they are usually regarded only as means for state reconstruction or fidelity measurement. Here, we show that the same Pauli-basis measurements (X, Y, Z) can be directly employed for the certification of nonlocality at no additional experimental cost. Our framework allows any tomographic data—including archival data sets—to be reinterpreted in terms of fundamental nonlocality tests. We introduce a generic, constructive method to generate tailored Bell inequalities and showcase their applicability to certify the nonlocality of states in realistic experimental scenarios. Recognizing the stabilizer nature of the considered operators, we analyze our inequalities in the context of witnessing quantum magic—a crucial resource for quantum computing. Our approach requires Pauli measurements only and tests the quantum magic solely through the resources present in the state. Our results establish a universal standard that unifies state tomography with nonlocality certification and its application to quantum magic witnessing, thereby streamlining both fundamental studies and practical applications.

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Phys. Rev. A 113, 052404– Published 1 May, 2026
  • Received 7 January 2026
  • Accepted 8 April 2026
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