Capturing exponential variance using polynomial resources: applying tensor networks to non-equilibrium stochastic processes

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
190 Downloads (Pure)

Abstract

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 $\mathrm{e}^{-\beta W}$, motivated by Jarzynski's equality, with $W$ the work done quenching from equilibrium at inverse temperature $\beta$, is exactly and efficiently captured by tensor networks.
Original languageEnglish
Article number090602
Number of pages7
JournalPhysical Review Letters
Volume114
Issue number9
Early online date5 Mar 2015
DOIs
Publication statusPublished - 6 Mar 2015

Keywords

  • cond-mat.stat-mech
  • quant-ph

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