Dieter Jaksch awarded with the 2018 Thomas Young Medal and Prize

for "his contributions to theoretical proposals enabling the study of non-equilibrium quantum many-body dynamics with unprecedented microscopic control in ultra-cold atoms, and establishing them as a quantum technologies platform".

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Jean-Marc Triscone awarded a honorary doctorate

by the Norwegian University of Science and Technology (NTNU)

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Publication Detail / Abstract

T. H. Johnson, T. J. Elliott, S. R. Clark, D. Jaksch

Capturing exponential variance using polynomial resources: applying tensor networks to nonequilibrium stochastic processes

published in PRL on March 5, 2015
> Full text via publisher
Estimating the expected value of an observable appearing in a non-equilibrium stochastic process usually involves sampling. If the observable’s variance is high, many samples are required. In contrast, we show that performing the same task without sampling, using tensor network compression, efficiently captures high variances in systems of various geometries and dimensions. We provide examples for which matching the accuracy of our efficient method would require a sample size scaling exponentially with system size. In particular, the high variance observable e−βW, motivated by Jarzynski’s equality, with W the work done quenching from equilibrium at inverse temperature β, is exactly and efficiently captured by tensor networks.
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