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cs.IT updates on arXiv.org

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A Variant of the Bravyi-Terhal Bound for Arbitrary Bounda...
François Arnault, Philippe Gaborit, Wouter Rozendaal, Nicolas Sa · 2025-02-07 · via cs.IT updates on arXiv.org

We present a modified version of the Bravyi-Terhal bound that applies to quantum codes defined by local parity-check constraints on a $D$-dimensional lattice quotient. Specifically, we consider a quotient $\mathbb{Z}^D/Λ$ of $\mathbb{Z}^D$ of cardinality $n$, where $Λ$ is some $D$-dimensional sublattice of $\mathbb{Z}^D$: we suppose that every vertex of this quotient indexes $m$ qubits of a stabilizer code $C$, which therefore has length $nm$. We prove that if all stabilizer generators act on qubits whose indices lie within a ball of radius $ρ$, then the minimum distance $d$ of the code satisfies $d \leq m\sqrt{γ_D}(\sqrt{D} + 4ρ)n^\frac{D-1}{D}$ whenever $n^{1/D} \geq 8ρ\sqrt{γ_D}$, where $γ_D$ is the $D$-dimensional Hermite constant. We apply this bound to derive an upper bound on the minimum distance of Abelian Two-Block Group Algebra (2BGA) codes whose parity-check matrices have the form $[\mathbf{A} \, \vert \, \mathbf{B}]$ with each submatrix representing an element of a group algebra over a finite abelian group.