Multipartite Entanglement at Finite Temperature.

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ID: 97140
2018
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Abstract
The interplay of quantum and thermal fluctuations in the vicinity of a quantum critical point characterizes the physics of strongly correlated systems. Here we investigate this interplay from a quantum information perspective presenting the universal phase diagram of the quantum Fisher information at a quantum phase transition. Different regions in the diagram are identified by characteristic scaling laws of the quantum Fisher information with respect to temperature. This feature has immediate consequences on the thermal robustness of quantum coherence and multipartite entanglement. We support the theoretical predictions with the analysis of paradigmatic spin systems showing symmetry-breaking quantum phase transitions and free-fermion models characterized by topological phases. In particular we show that topological systems are characterized by the survival of large multipartite entanglement, reaching the Heisenberg limit at finite temperature.
Reference Key
gabbrielli2018multipartitescientific Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Gabbrielli, Marco;Smerzi, Augusto;Pezzè, Luca;
Journal Scientific reports
Year 2018
DOI
10.1038/s41598-018-31761-3
URL
http://link.springer.com/article/10.1038/s41598-018-31761-3
Keywords Keywords not found

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