Multipartite entanglement in topological quantum phases
Quantum Physics
2017-12-27 v1 Quantum Gases
Superconductivity
Abstract
We witness multipartite entanglement in the Kitaev chain -- a benchmark model of one dimensional topological insulator -- also with variable-range pairing, using the quantum Fisher information. Phases having a finite winding number, both for short- and long-range pairing, are characterized by a power-law diverging finite-size scaling of multipartite entanglement. Moreover the occurring quantum phase transitions are sharply marked by the divergence of the derivative of the quantum Fisher information, even in the absence of a closing energy gap.
Cite
@article{arxiv.1706.06539,
title = {Multipartite entanglement in topological quantum phases},
author = {Luca Pezzè and Marco Gabbrielli and Luca Lepori and Augusto Smerzi},
journal= {arXiv preprint arXiv:1706.06539},
year = {2017}
}
Comments
5 pages, 3 figures + supplemental materials