Description

Semniar by Dr Matthias Kleinmann

WHEN: Thursday, 15 november 2018, at 11:45h

WHERE:  Salon de Grados, Facultad de Ciencia & Tecnologia

TITLE: Detecting and avoiding signaling in Bell-type experiments

ABSTRACT:

Bell tests were originally designed to enable the exclusion of local hidden variable models. However, their relevance goes beyond this and high violations of Bell inequalities have many applications, for example, in randomness generation, entanglement quantification, or self-testing. Then, the specific value of a Bell
correlator and the experimental reliability of this value are an important concern. We analyze typical photonic setups and find that those setups are susceptible to systemic errors. These errors can be
readily revealed by testing the nonsignaling conditions. We also present an experiment with polarization-entangled photons in which we avoid sources of systematic errors, allowing us to establish the
highest reliable value for the Clauser-Horne-Shimony-Holt correlator to date.