9. Nobody checked which state IBM's flagship quantum chemistry results compute (zenodo.org)

This is the data-and-code archive for the preprint "Which state are youΒ converging? A spin audit of sample-based quantum diagonalization benchmarks onΒ iron–sulfur clusters." Sample-based quantum diagonalization (SQD, also called QSCI) selects electronicΒ configurations from quantum-circuit samples and diagonalizes the Hamiltonian inΒ that subspace. Its iron–sulfur demonstrations, on the [2Fe-2S] and [4Fe-4S]Β clusters, are among the headline evidence for utility-scale quantum chemistry.Β This work asks a question the original benchmarks did not: when the projectedΒ energy converges, has the calculation actually converged to the target spinΒ state? Using a rotation-invariant spin audit, exact determinant-space ⟨S²⟩, invariant SΒ²-Gram spectra across near-degenerate manifolds, and higher spinΒ moments, it finds that no audited execution returns the named singlet at aΒ competitive energy. At the largest published dimension (5.625Γ—10⁷ determinants),Β the numerically stable lowest root lies about 170 mHa below the published energyΒ but at ⟨S²⟩ = 1.37, nowhere near a singlet, and the released hardware samplesΒ show no energy advantage over their own uniform-random control. TheΒ recommendation: measured spin moments should become a required benchmark output. The archive lets a reader reproduce and check the analysis. Start withΒ START_HERE.md inside the zip. The package holds the paper (Markdown, LaTeX, andΒ PDF), every analysis and figure script, the per-run result archives, aΒ reproduction map tying each headline claim to the artifact and command thatΒ regenerate it, and the audit trail. Four large files ship next to the zip as standalone companions rather thanΒ inside it: the flagship-dimension amplitude archive and three certificationΒ vector blocks. SHA-256 hashes for the zip and all four companions are recordedΒ in SHA256SUMS inside the package, so every file can be integrity-checked beforeΒ use.

IBM’s recent research on quantum chemistry raises questions about the accuracy of its findings regarding electronic configurations in iron-sulfur clusters. The study highlights the method of sample-based quantum diagonalization, which could have significant implications for the field, making it essential reading for those interested in quantum computing advancements.

10. Show HN: cMCP, deny an AI agent's tool call and get a signed receipt (github.com)

cMCP: Confidential MCP Gateway. Hardware-attested policy enforcement for MCP tool calls. - agentrust-io/cmcp

cMCP offers a hardware-based solution for enforcing policies on tool calls made by AI agents, ensuring accountability with signed receipts. This technology aims to enhance security and trust in AI interactions.

13. The Sound of Inevitability (www.panoptica.com)

A 23-year-old raised $225 million, rode an AI thesis to a $25 billion peak, and then watched two-thirds of it vanish in a week. This is the story of how being right about the future isn't enough if you get the math of leverage and timing wrong β€” and why the market's oldest predators are always waiting for exactly this moment. It's a sharp look at genius, hubris, and the difference between having an edge and knowing how much to bet on it.

A young entrepreneur experienced a meteoric rise and fall in the tech world, raising substantial funds based on an AI vision before suffering massive losses. This account highlights the pitfalls of over-leverage and timing in a volatile market, offering insights into the balance between innovation and risk.

15. Show HN: Blender for AI Agents (www.mixar.app)

Mixar is a 3D editor built on Blender with an AI agent inside it. Automate retopology, UV rebuilds, baking and export prep, and generate when you need to.

18. Living in the Math World Means Threading the Needle (www.quantamagazine.org)

Focus, commitment, and insight resulted in a β€œonce in a century” proof. Hong Wang is now just the third woman to win a Fields Medal.

Hong Wang’s groundbreaking proof has earned her a prestigious Fields Medal, making her only the third woman to achieve this honor. Discover the dedication and insight that led to this significant mathematical breakthrough.

19. The Judgment Reservoir (shannph.com)

Your teams are shipping faster than ever and learning less than they have in years. That is not a training problem. It is a structural one.

Companies are increasing their shipping speed but failing to learn from their processes, indicating a deeper structural issue within teams. Addressing this could lead to improved efficiency and knowledge retention.

20. Your open tabs are unfinished decisions, not bookmarks (gettably.tech)

Keep the decision without keeping the tab. A practical field guide from Tably.

Tably offers a practical guide on how to manage your open tabs by reframing them as unfinished decisions rather than simple bookmarks. Learn strategies to clear your browser while still keeping track of important choices.

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