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Jian-Qi Sheng

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Preprint Aug 2026

String-Monodromy Rigidity from Six-Point Consistency

Can the characteristic monodromy of string scattering be derived from S-matrix consistency alone, without assuming a worldsheet? We show that finite-particle consistency fixes it to a sharply defined extent. In a massless doubly ordered identity model, two exact six-point residues generate a scalar pentagon and the odd...

Jian-Qi Sheng · 0 citations
Preprint Aug 2026

Diffusive Speed Limits for U(1)-Covariant Quantum Error Correction

Fast preparation of quantum error-correcting codes is essential for scalable quantum memories, but geometric locality and $U(1)$ charge conservation impose an unavoidable transport constraint. We combine exact complementary-channel geometry, charge-sector Haar analysis, and a gate-resolved connected-moment expansion to...

Jian-Qi Sheng · 0 citations
Preprint Jul 2026

When Quantum States over Spacetime Have No Common Process

Determining whether observations across spacetime arise from one quantum process is central to causal inference and to consistent observer-relative descriptions. For quantum-state-over-spacetime (QSOST) data, this remains obstructed because causally agnostic interferometry compresses process matrices: every setting can...

Jian-Qi Sheng · 0 citations

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