Dr. Matteo Fadel, SNSF Ambizione Fellow at ETHZ
Bell nonlocality is among the strongest forms of correlation, capturing departures from classical intuition that are revealed through the violation of Bell inequalities. Yet deriving Bell inequalities is itself a formidable mathematical task, which has often been limited to scenarios involving only a few parties. In this talk I will present a paradigm shift that allows for deriving novel multipartite Bell inequalities that remain valid for an arbitrarily large number of particles. I will then highlight a particularly useful subset that functions as device-independent dimensionality witnesses: their violation certifies a lower bound on the local Hilbert-space dimension accessible to each party. Finally, I will show how these inequalities can be casted into experimentally convenient witness tailored to measurements on entangled atomic ensembles, and I will present their violation with spinor Bose-Einstein condensate experiments, demonstrating that the observed statistics cannot be explained by qubits only.
Recording
The talk will be streamed and there will be a recording.