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DESCRIPTION:Matthew Hastings\, Station Q\, UCSB\n\nWhile entropy was introd
uced in thermodynamics to describe heat engines\, its applications have sp
read to widely different areas. I will talk about recent research on two s
uch problems. The first is a problem in information theory: how much infor
mation can we send over a noisy communication channel\, given that the wor
ld is described by quantum mechanics? I will explain the so-called "additi
vity conjecture"\, which was a proposed way to calculate the communication
capacity of such a channel\, and I will explain my recent result disprovi
ng this conjecture\, showing that we can use entanglement to boost communi
cation capacity. The second problem is in quantum systems far from equilbr
ium. Here I will describe how entropy can arise from quantum entanglement\
, and I will discuss novel simulation algorithms and future experiments pr
obing the relaxation back to local thermal equilibrium.
DTSTART:20091016T200000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Entropy in Quantum Information Theory and Condensed Matter Physics
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