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Colloquia
Colloquium
Friday, November 7, 2003
4:00 PM
Physics Building, Room 204
Note special time.

Paul Kwiat
[Host: Olivier Pfister]
U of Illinois, UrbanaChampaign
"Entangled Photons for Quantum Information: 101 uses for a Schroedinger cat"

ABSTRACT:
We have developed a means of producing entangled pairs of photons, using the
process of spontaneous parametric downconversion in a novel twocrystal
geometry. The quality of the source has enabled us to produce states of
unparalleled purity, while the brightness has permitted an extreme violation
of Bell's inequalities. Furthermore, the source is tunable, and we have
been able to produce for the first time nonmaximally entangled states, and
states of arbitrary purity. The result is the capability to produce
(almost) any twophoton quantum (polarization) state. Such states have
application to such problems in quantum information as quantum cryptography,
quantum teleportation, and quantum cooking. 



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