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Title: Locality and nonlocality of classical restrictions of quantum spin systems with applications to quantum large deviations and entanglement

We study the projection on classical spins starting from quantum equilibria. We show Gibbsianness or quasi-locality of the resulting classical spin system for a class of gapped quantum systems at low temperatures including quantum ground states. A consequence of Gibbsianness is the validity of a large deviation principle in the quantum system which is known and here recovered in regimes of high temperature or for thermal states in one dimension. On the other hand, we give an example of a quantum ground state with strong nonlocality in the classical restriction, giving rise to what we call measurement induced entanglement and still satisfying a large deviation principle.
Authors:
; ;  [1] ;  [2]
  1. Instituut voor Theoretische Fysica, KU Leuven, Leuven (Belgium)
  2. Institute of Physics AS CR, Prague (Czech Republic)
Publication Date:
OSTI Identifier:
22403111
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Mathematical Physics; Journal Volume: 56; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GROUND STATES; LOCALITY; QUANTUM ENTANGLEMENT; SPIN