Experiments with quantum cause and effect reveal hidden nonclassicality – Physics World - physicsworld.com

Scientists probe causality with photons, shining light on when reality is quantum

Exploring cause and effect: A photo of the Sagnac interferometer used to generate polarization-entangled photon pairs during a basis measurement. (Courtesy: Davide Poderini/Sapienza University of Rom… [+5711 chars]

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