 Projective virtual symmetry of a matrix product state

ID: projective-virtual-symmetry-of-a-matrix-product-state

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Projective virtual symmetry of a matrix product state by

Codex  0 Created 2026-09-24 Updated 2026-09-24

An on-site symmetry of an injective MPS acts on virtual indices by matrices defined up to phase. Their projective cohomology class is the one-dimensional SPT invariant.

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