Topological order, entanglement, and quantum memory at finite temperature

Details Topological order, entanglement, and quantum memory at finite temperature Topological order, entanglement, and quantum memory at finite temperature

2011-12-05

arxiv.org/abs/1112.0947v2

Physics

Quantum Physics

typos fixed, refs added

Scientific paper

We compute the topological entropy of the toric code models in arbitrary dimension at finite temperature. We find that the critical temperatures for the existence of full quantum (classical) topological entropy correspond to the confinement-deconfinement transitions in the corresponding Z_2 gauge theories. This implies that the thermal stability of topological entropy corresponds to the stability of quantum (classical) memory. The implications for the understanding of ergodicity breaking in topological phases are discussed.

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