Robust self-testing based on Gisin's arbitrary-input Bell inequality

Self-testing refers to the strongest device-independent (DI) certification method that validates the nature of a quantum system and devices solely based on the observed statistics. We demonstrate the self-testing of state and measurements based on the Gisin Bell inequality (GBI) featuring arbitrary inputs for both parties. We introduce a systematic and elegant sum-of-squares (SOS) approach that enables the dimension-independent derivation of the optimal quantum violation of GBI. We derive the state and the interrelation between the local observables directly from the optimization condition. Since the practical experimental scenario involves inevitable noise and imperfection, we present a comprehensive strategy for robust self-testing.

Source: arXiv:2606.10983v1 - http://arxiv.org/abs/2606.10983v1 PDF: https://arxiv.org/pdf/2606.10983v1 Original Link: http://arxiv.org/abs/2606.10983v1