From World Science Festival.

Step into the mind of Nobel laureate Alain Aspect, one of the pioneers who turned quantum weirdness into experimental reality. In this conversation with Brian Greene, Aspect retraces the century-long quest to understand quantum entanglement, nonlocality, and Bell’s theorem—ideas that shattered classical physics and redefined reality itself.

Winner of the 2022 Nobel Prize in Physics, Aspect’s groundbreaking experiments proved that Einstein was wrong. Here, he reveals how that discovery shattered classical intuition and redefined what “reality” means.

This program is part of the Big Ideas series, supported by the John Templeton Foundation.

Participant: Alain Aspect
Moderator: Brian Greene

00:00 – Introduction
04:06 – Early Quantum History: Planck, Einstein, de Broglie
14:20 – Interpretations, Collapse, and the Limits of Quantum Theory
29:33 – Bell’s Inequality and Bohm’s Hidden Variables
33:19 – switching polarizer orientations while photons are in flight
37:19 – improving on Clauser–Freedman
47:02 – Quantum Technologies, Optimism, and the Future

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