Toric code made subsystem: a framework for topological subsystem codes using anticommuting quantum spin liquids

• URL: http://arxiv.org/abs/2606.26226v1
• Date: Wed, 24 Jun 2026 18:00:01 GMT
• Title: Toric code made subsystem: a framework for topological subsystem codes using anticommuting quantum spin liquids
• Abstract summary: We introduce a framework for constructing subsystem codes based on the class of anticommuting quantum spin liquids.<n>The code inherits the many-body topological order of the quantum spin liquid, making it a topological subsystem code.<n>We present two concrete and detailed examples for constructing these codes on a square lattice and a kagome lattice geometry.
• Score: 0.8307668828380428
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We introduce a framework of constructing topological subsystem codes based on the class of anticommuting quantum spin liquids described in [Phys. Rev. B 113, 064402 (2026)]. A canonical model from this class can be considered as a spatial modification of the toric code that voids its stabilizer code property. Rather, these models contain an extensive set of anticommuting local conserved operators that lead to an extensive ground state degeneracy. This degeneracy forms the basis of the subsystem degrees of freedom in the associated quantum error correcting code. The code inherits the many-body topological order of the quantum spin liquid, making it a topological subsystem code. We present two concrete and detailed examples for constructing these codes on a square lattice and a kagome lattice geometry, requiring weight-4 and weight-3 local check operator measurements respectively. In contrast to other subsystem codes, a unique property of these codes is the presence of an extensive number of local gauge qubits that are left undisturbed by the check operators apart from the logical qubits. Our construction provides a template for generating this new category of topological subsystem codes on different lattice or graph geometries, suitable for implementation on various quantum hardware platforms.

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