Topological squashed entanglement: Nonlocal order parameter for one-dimensional topological superconductors

  title={Topological squashed entanglement: Nonlocal order parameter for one-dimensional topological superconductors},
  author={Alfonso Maiellaro and Antonio Di Marino and Fabrizio Illuminati},
  journal={Physical Review Research},
Identifying entanglement-based order parameters characterizing topological systems, in particular topological superconductors and topological insulators, has remained a major challenge for the physics of quantum matter in the last two decades. Here we show that the end-to-end, long-distance, bipartite squashed entanglement between the edges of a many-body system, defined in terms of the edge-to-edge quantum conditional mutual information, is the natural nonlocal order parameter for topological… 

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