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SEQUENCE:0
UID:UW-Physics-Event-4062
DTSTART:20160317T210000Z
DTEND:20160317T220000Z
DTSTAMP:20240329T083854Z
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.
\n
\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.
\n
\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.
\n
URL:https://www.physics.wisc.edu/events/?id=4062
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