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<p>Recordamos el coloquio especial de hoy,<br>
<br>
<br>
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COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEYN - UBA<br>
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<a href="http://www.df.uba.ar" target="_blank">http://www.df.uba.ar</a><br>
<br>
Charlas, café y masitas<br>
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<br>
En el Aula 3, 1er piso, Pab. I<br>
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Viernes 30/11, 14hs, <br>
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From Einstein's intuition to quantum bits: a new quantum age<br>
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ALAIN ASPECT<br>
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Laboratoire Charles Fabry, Institute d'Optique, CNRS, France<br>
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In 1935, with co-authors Podolsky and Rosen, Einstein discovered an<br>
amazing quantum situation, where particles in a pair are so strongly correlated<br>
that Schrödinger called them "entangled". By analysing that situation,<br>
Einstein concluded that the quantum formalism was incomplete. Niels Bohr<br>
immediately opposed that conclusion, and the debate lasted until the<br>
death of these two giants of physics, in the 1950's.<br>
In 1964, John Bell produced his famous inequalities, which allowed<br>
experimentalists to settle the debate, and to show that the revolutionary<br>
concept of entanglement is indeed a reality.<br>
Based on that concept, a new field of research has emerged, quantum<br>
information, where one uses quantum bits, the so-called "qubits". In<br>
contrast to classical bits which are either in state 0 or state 1, qubits<br>
can be simultaneously in state 0 and state 1, as a Schrödinger cat could<br>
be simultaneously dead and alive.<br>
Entanglement between qubits enables conceptually new methods for<br>
processing and transmitting information. Large scale practical implementation of<br>
such concepts might revolutionize our society, as did the laser, the<br>
transistor and integrated circuits, some of the most striking fruits of the first<br>
quantum revolution, which began with the 20th century.<br>
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