From Einstein's doubts to quantum information: a new quantum revolution

ESRF Colloquia
Start Date
23-06-2017 14:30
End Date
23-06-2017 16:30
Auditorium, Central Building
Speaker's name
Alain Aspect
Speaker's institute
Institut d'Optique Graduate School, Université Paris-Saclay
Contact name
Fabienne Mengoni
Host name
P. Bruno and C. Ferrero
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In 1935, with co-authors Podolsky and Rosen, Einstein discovered a weird quantum situation, in which particles in a pair are so strongly correlated that Schrödinger called them “entangled”. By analyzing that situation, Einstein concluded that the quantum formalism is incomplete. Niels Bohr immediately opposed that conclusion, and the debate lasted until the death of these two giants of physics. 

In 1964, John Bell discovered that it is possible to settle the debate experimentally, by testing the now celebrated "Bell's inequalities", and to show directly that the revolutionary concept of entanglement is indeed a reality. A long series of experiments, started in 1972, yield more and more precise results, in situations closer and closer to the ideal theoretical scheme.

After explaining the debate, and describing some experiments, I will also show how this conceptual discussion has prompted the emergence of the new field of quantum information and quantum technologies.


Visitors from off-site please contact Fabienne Mengoni tel +33 (0)4 76 88 20 44 to arrange for a gate pass.
Requests made by e-mail will be confirmed.
If you do not receive a confirmation e-mail, please contact us by phone.