[Todos] HOY: Coloquios Extraordinarios DF - Rajarshi Roy - 14hs Aula Seminario

[Augusto Roncaglia]

COLOQUIOS EXTRAORDINARIOS DEL DEPARTAMENTO DE FÍSICA EXACTAS - UBA


              En el AULA SEMINARIO, 2do piso, Pab. I,

              Lunes 3/12 - 14hs

              RAJARSHI ROY (University of Maryland)

*Random Numbers from Light:  Photons, Time delays, Chaos and Entropy*

Many physical processes, including the intensity fluctuations of a chaotic
laser, the detection of single photons, and the Brownian motion of a
microscopic particle in a fluid are unpredictable, at least on long
timescales. This unpredictability can be due to a  variety of physical
mechanisms, but it is quantified by an entropy rate. This rate, which
describes how quickly a system produces new and random information, is
fundamentally important in statistical mechanics and practically important
for random number generation. We experimentally study entropy generation
and the emergence of deterministic chaotic dynamics from discrete noise in
a system that applies feedback to a weak optical signal at the
single-photon level. We show that in this system the dynamics transition
from shot noise to chaos as the photon rate increases and that the entropy
rate can reflect either the deterministic or noisy aspects of the system
depending on the sampling rate and resolution of the measurements.
------------ próxima parte ------------
Se ha borrado un adjunto en formato HTML...
URL: <http://mailman.df.uba.ar/pipermail/todos/attachments/20181203/ecc900c0/attachment.html>