English

Symmetry protected topological order as a requirement for measurement-based quantum gate teleportation

Quantum Physics 2024-01-09 v3

Abstract

All known resource states for measurement-based quantum teleportation in correlation space possess symmetry protected topological order, but is this a sufficient or even necessary condition? This work considers two families of one-dimensional qubit states to answer this question in the negative. The first is a family of matrix-product states with bond dimension two that includes the cluster state as a special case, protected by a global non-onsite symmetry, which is characterized by a finite correlation length and a degenerate entanglement spectrum in the thermodynamic limit but which is unable to deterministically teleport a universal set of single-qubit gates. The second are states with bond dimension four that are a resource for deterministic universal teleportation of finite single-qubit gates, but which possess no symmetry.

Keywords

Cite

@article{arxiv.2310.10561,
  title  = {Symmetry protected topological order as a requirement for measurement-based quantum gate teleportation},
  author = {Zhuohao Liu and Emma C. Johnson and David L. Feder},
  journal= {arXiv preprint arXiv:2310.10561},
  year   = {2024}
}

Comments

The apparent non-degeneracy of the entanglement spectrum for SPT states is resolved; other changes in response to referee comments