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Robustness in projected entangled pair states

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Cirac, J. Ignacio and Michalakis, Spyridon and Pérez García, David and Schuch, Norbert (2013) Robustness in projected entangled pair states. Physical Review B, 88 (11). ISSN 1098-0121

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Official URL: http://journals.aps.org/prb/abstract/10.1103/PhysRevB.88.115108



Abstract

We analyze a criterion which guarantees that the ground states of certain many-body systems are stable under perturbations. Specifically, we consider PEPS, which are believed to provide an efficient description, based on local tensors, for the low energy physics arising from local interactions. In order to assess stability in the framework of PEPS, one thus needs to understand how physically allowed perturbations of the local tensor affect the properties of the global state. In this paper, we show that a restricted version of the local topological quantum order (LTQO) condition [Michalakis and Pytel, Commun. Math. Phys. 322, 277 (2013)] provides a checkable criterion which allows us to assess the stability of local properties of PEPS under physical perturbations. We moreover show that LTQO itself is stable under perturbations which preserve the spectral gap, leading to nontrivial examples of PEPS which possess LTQO and are thus stable under arbitrary perturbations.


Item Type:Article
Subjects:Sciences > Physics > Quantum theory
ID Code:27934
Deposited On:13 Feb 2015 12:38
Last Modified:13 Feb 2015 12:38

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