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Fiber Bundle Codes: Breaking the $N^{1/2} \operatorname{polylog}(N)$ Barrier for Quantum LDPC Codes

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arxiv 2009.03921 v2 pith:XDGZUTDN submitted 2020-09-08 quant-ph cs.ITmath.COmath.IT

classification quant-phcs.ITmath.COmath.IT
keywords codesldpcoperatornamepolylogquantumbundlecodeconstruction
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

We present a quantum LDPC code family that has distance $\Omega(N^{3/5}/\operatorname{polylog}(N))$ and $\tilde\Theta(N^{3/5})$ logical qubits. This is the first quantum LDPC code construction which achieves distance greater than $N^{1/2} \operatorname{polylog}(N)$. The construction is based on generalizing the homological product of codes to a fiber bundle.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. From Koszul-Complex Stabilizer Models to Superselection Profiles: Topological Rigidity and Nonsplit Extensions

    quant-ph 2026-08 conditional novelty 7.0 of 10

    For single-layer translation-invariant CSS codes, the nonzero superselection layer and its degree determine the stable translation-invariant Clifford class; multi-layer nonsplit extensions show individual layers do no...

  2. Logical Spectroscopy: Lifted-Product Codes with Addressable Bases

    quant-ph 2026-07 accept novelty 7.0 of 10

    Logical spectroscopy decomposes Abelian lifted-product codes into Frobenius packets, builds a complete addressable conjugate logical basis by finite-field algebra plus idempotent lifts, and supplies design diagnostics...

  3. Demystifying the Balanced Product Code: A Review

    quant-ph 2025-05 conditional novelty 3.0 of 10

    A pedagogical re-derivation of balanced product quantum LDPC codes using parity-check matrices, with worked examples and proof sketches, containing no new theorem beyond the known literature.

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