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UID:UW-Physics-Event-4062
DTSTART:20160317T210000Z
DTEND:20160317T220000Z
DTSTAMP:20260415T050847Z
LAST-MODIFIED:20160315T130650Z
LOCATION:2241 Chamberlin Hall (coffee at 3:45 pm)
SUMMARY:From Bell's inequalities to quantum information:  a new quantu
 m revolution\, Physics Department Colloquium\, Alain Aspect\, CNRS\, I
 nstitut d’Optique
DESCRIPTION:In 1935\, with co-authors Podolsky and Rosen\, Einstein di
 scovered an intriguing quantum situation\, in which particles in a pai
 r are so strongly correlated that Schrödinger called them “entangle
 d”. By analyzing that situation\, Einstein concluded that the quantu
 m formalism is incomplete. Niels Bohr immediately opposed that conclus
 ion\, and the debate lasted until the death of these two giants of phy
 sics. 

<br>
\n<br>
\nThirty years later\, John Stuart Bell discov
 ered that it is possible to settle the debate experimentally\, by test
 ing the famous "Bell's inequalities"\, and to show directly that the r
 evolutionary concept of entanglement is indeed a reality. 

A long
  series of experiments closer and closer to the ideal scheme proposed 
 by Bell has confirmed that entanglement is indeed "a great quantum mys
 tery"\, to use the words of Feynman.<br>
\n<br>
\nBased on that concep
 t\, a new field of research has emerged\, quantum information\, where 
 one uses quantum bits\, the so-called “qubits”\, to encode the inf
 ormation and process it. Entanglement between qubits enables conceptua
 lly new methods for processing and transmitting information. Large-sca
 le practical implementation of such concepts might revolutionize our s
 ociety\, as did the laser\, the transistor and integrated circuits\, s
 ome of the most striking fruits of the first quantum revolution\, whic
 h began with the 20th century. To cite only the simplest example of th
 ese new concepts\, quantum cryptography allows one to guarantee an abs
 olute privacy of communications\, based on the most fundamental laws o
 f quantum mechanics.<br>
\n
URL:https://www.physics.wisc.edu/events/?id=4062
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