We witness multipartite entanglement in the ground state of the Kitaev chain - a benchmark model of a one dimensional topological superconductor - also with variable-range pairing, using the quantum Fisher information. Phases having a finite winding number, for both 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.
Multipartite Entanglement in Topological Quantum Phases
Gabbrielli M;Smerzi A
2017
Abstract
We witness multipartite entanglement in the ground state of the Kitaev chain - a benchmark model of a one dimensional topological superconductor - also with variable-range pairing, using the quantum Fisher information. Phases having a finite winding number, for both 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.File in questo prodotto:
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