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arXiv:1112.0947 · Annals of Physics

Topological order, entanglement, and quantum memory at finite temperature

Dalimil Mazáč, Alioscia Hamma

Published May 22, 2012• 18 citations
arXivHTMLPDF
DOI
10.1016/j.aop.2012.05.004

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As a prototype model of topological quantum memory, two-dimensional toric code is genuinely immune to generic local static perturbations, but fragile at finite temperature and also after non-equilibrium time evolution at zero temperature. We show that dynamical localization induced by disorder makes the time evolution a local unitary transformation at all times, which keeps topological order robust after a quantum quench. We verify this conclusion by investigating the Wilson loop expectation value and topological entanglement entropy. Our results suggest that the two dimensional topological quantum memory can be dynamically robust at zero temperature.