Flavien Hirsch - CHSH violation with optimal resources and partial information

CHSH violation with optimal resources and partial information

This seminar, given by Flavien Hirsch, will happend on 09 September 2025, at 13:0. It will take place in Room 26-00/534.

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Abstract

Entanglement is necessary for Bell nonlocality. In the case of the CHSH inequality/game, Bell pairs i.e. two-qubit maximally entangled states are known to be optimal to reach the Tsirelson bound. Nevertheless, from an informational perspective, one might wonder if Alice and Bob both need to exactly know the state they share to play CHSH optimally, or if some degree of epistemic ignorance is allowed. In this talk, we consider a variation of the standard Bell bipartite scenario, where Alice and Bob play the CHSH with optimal resources i.e. Bell pairs, but imperfect information about them, in order to answer the question How ignorant can Alice and Bob be about the optimal resources they share and still reach the Tsirelson bound, or at least violate the Bell-local bound?

All the best, Marco