No-cost Bell Nonlocality Certification from Quantum Tomography and Its Applications in Quantum Magic Witnessing

• URL: http://arxiv.org/abs/2512.25068v1
• Date: Wed, 31 Dec 2025 18:59:24 GMT
• Title: No-cost Bell Nonlocality Certification from Quantum Tomography and Its Applications in Quantum Magic Witnessing
• Authors: Pawel Cieslinski, Lukas Knips, Harald Weinfurter, Wieslaw Laskowski,
• Abstract summary: We show that the same Pauli-basis measurements can be employed for the certification of nonlocality.<n>Our framework allows any tomographic data to be reinterpreted in terms of fundamental nonlocality tests.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 datasets -- 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 non-locality 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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