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--></style><title>MIT Quantum Information Processing Seminar
Announcemen</title></head><body>
<div>Next week's MIT QIP seminar will take place on Monday, April 5th
at 16:00 in 4-237, and features:</div>
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<div align="center"><font size="+2"><b>Localizable Entanglement and
Valence Bond States</b></font></div>
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<div align="center"><font size="+1"><i>by</i> Ignacio Cirac (<i>Max
Planck Institute fuer Quantumoptik, Garching,
Germany</i>)</font></div>
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<div align="center"><u>ABSTRACT</u></div>
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<blockquote>Much of the current effort in Quantum Information Theory
is devoted to the description and quantification of the entanglement
contained in quantum states, since this intriguing property of Quantum
Mechanics is the basic resource of most of the applications in this
field, including quantum communication and computation. In this talk I
will introduce a new notion of entanglement which captures the idea of
how this property can be localized in small subsystems by performing
measurement in the rest of the system. I will also show how this
notion allows to detect hidden orders in spin systems at zero
temperature, and how it behaves in quantum phase transitions. Finally,
I will show how these ideas may help to develop simulation schemes for
spin chains and lattices.</blockquote>
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