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Direct observation of quantum criticality in Ising spin chains

Authors
  • Zhang, Jingfu
  • Cucchietti, Fernando M.
  • Chandrashekar, C. M.
  • Laforest, Martin
  • Ryan, Colm A.
  • Ditty, Michael
  • Hubbard, Adam
  • Gamble, John K.
  • Laflamme, Raymond
Type
Published Article
Publication Date
Jan 11, 2009
Submission Date
Aug 11, 2008
Identifiers
DOI: 10.1103/PhysRevA.79.012305
Source
arXiv
License
Yellow
External links

Abstract

We use NMR quantum simulators to study antiferromagnetic Ising spin chains undergoing quantum phase transitions. Taking advantage of the sensitivity of the systems near criticality, we detect the critical points of the transitions using a direct measurement of the Loschmidt echo. We test our simulators for spin chains of even and odd numbers of spins, and compare the experimental results to theoretical predictions.

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