Compare Papers
Paper 1
Measuring the capabilities of quantum computers
Timothy Proctor, Kenneth Rudinger, Kevin Young, Erik Nielsen, Robin Blume-Kohout
- Year
- 2021
- Journal
- Nature Physics
- DOI
- 10.1038/s41567-021-01409-7
- arXiv
- -
No abstract.
Open paperPaper 2
On Symmetry-Compatible Superselection Structures for Product States in 2D Quantum Spin Systems
Matthew Corbelli
- Year
- 2025
- Journal
- arXiv preprint
- DOI
- arXiv:2510.23790
- arXiv
- 2510.23790
We study superselection sectors in two-dimensional quantum spin systems with an on-site action of a compact abelian group $G$. Naaijkens and Ogata (2022) arXiv:2102.07707 showed that for states quasi-equivalent to a product state, the superselection structure is trivial, reflecting the absence of long-range entanglement. We consider a symmetry-compatible refinement of this setting, in which both the superselection criterion and the notion of equivalence between representations are required to respect the $G$-action. Under this stricter notion of equivalence, the sector structure for a $G$-equivariant product representation becomes nontrivial: the $G$-equivariant superselection sectors are classified by elements of the Pontryagin dual $\widehat{G}$. This shows that even in phases without long-range entanglement, imposing symmetry compatibility can lead to nontrivial sector structure.
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