2026-06-24 · 9 min read · quantum optics
A technical briefing on arXiv:2606.24643: Biancalana's Quantum Split-Step Fourier algorithm propagates classical mean field + Bogoliubov matrices U, V of quantum fluctuations through the same split-step integrator used in nonlinear Schrodinger simulations, then reconstructs symplectic eigenvalues, Williamson modes, and von Neumann entropy for any spectral window. Lossless Gaussian regime, exact diagnostics, low effective dimension even for radiation spanning many Fourier bins.
2026-06-23 · 6 min read · optics
A technical briefing on arXiv:2606.24639: This research demonstrates a method to design photonic crystal waveguides that significantly enhance bandwidth and reduce losses, improving their performance for optical applications.
2026-06-23 · 9 min read · quantum algorithms
A technical briefing on arXiv:2606.23614: lifting the Hamming-weight-with-a-spike AQO tunneling argument onto the structural property of log-concave ground states, with new spectral-gap bounds and a quadratic-ramp extension.
2026-06-22 · 8 min read · quantum simulation
A technical briefing on arXiv:2606.20551: a controlled head-to-head of adiabatic, multi-frequency cooling, and QAOA on a solvable fermionic Hamiltonian with a phase transition, with a phase diagram and parameter-robustness numbers.
2026-06-22 · 8 min read · diamond photonics
A technical briefing on arXiv:2606.20412: an ICP-RIE recipe that thins direct-bonded diamond membranes to â¤300 nm while keeping roughness below 0.5 nm, plus a colorimetry-based thickness check that matches white-light interferometry at 5 nm.
2026-06-19 · 6 min read · quantum machine learning
Bridging the Fourier and tensor-network views of quantum machine learning. We dissect arXiv:2606.20402, showing how entangling tensor kernels factorize Fourier coefficient tensors as Matrix Product Operators.
2026-06-14 · 6 min read · materials science
A technical briefing on arXiv:2606.19133: how SO(3)-equivariant graph neural networks capture geometric expressiveness to outperform rotation-invariant models in materials screening.
2026-06-13 · 5 min read · quantum metrology
A briefing on arXiv:2606.18169: utilizing Holevo's framework and Toeplitz matrix optimization to establish absolute Heisenberg limits in quantum phase estimation.
2026-06-12 · 6 min read · photonics
A technical briefing on arXiv:2606.16938: Achieving simultaneous all-optical edge detection and classification using integrated spin-multiplexed nonlocal metasurfaces.
2026-06-11 · 5 min read · quantum information
A technical briefing on arXiv:2606.14698: Confirming the globally information-optimal measurement for symmetric state ensembles through the resolution of the quantum pyramids conjecture.
2026-06-10 · 6 min read · quantum ml
A briefing on arXiv:2606.13641: introducing a unified Hamiltonian framework that leverages pairwise interactions to maximize information density in near-term quantum processors.
2026-06-10 · 7 min read · quantum
A briefing on arXiv:2606.12394: establishing a parallel protocol that achieves asymptotically optimal O(1/n) noise suppression for quantum gate purification.
2026-06-10 · 6 min read · optics
A briefing on arXiv:2606.10253: proving that spatial multiplexing in ONNs can serve as a trainable representational coordinate, enabling million-parameter hybrid vision-language systems.
2026-06-09 · 5 min read · micromanipulation
A briefing on arXiv:2606.09554: Establishing absolute physical limits for optical trapping performance. We dissect a new framework that casts trap stiffness maximization as a convex optimization problem.
2026-06-09 · 4 min read · optics
A briefing on arXiv:2606.07265: computing true multi-input multi-output convolutions in a single shot using spatial micro-organization, microlens arrays, and optical sum-reduction.
2026-06-03 · 9 min read · briefing
A briefing on Rodionenko et al.'s (arXiv:2606.03950) discovery of simultaneous dipolar and quadrupolar topological phases in multi-orbital systems. They demonstrate how 2D systems can support doubly-protected corner states through nested Wilson loops.
2026-06-03 · 9 min read · briefing
A briefing on Fldzhyan et al.'s (arXiv:2606.02451) breakthrough in photonic computing. They demonstrate how Matrix-Vector Multiplication can be performed with a 10x reduction in phase-shift range, significantly reducing thermal crosstalk and power consumption.
2026-06-03 · 8 min read · briefing
A briefing on Wang et al.'s (arXiv:2605.29536) study of single-photon scattering in directional waveguide arrays. They reveal how chiral configurations transform spatial coordinates into time-like evolution, mapping to (1+1)D and (2+0)D Dirac equations.
2026-06-02 · 7 min read · briefing
A briefing on Qiu et al.'s experimental realization of an orbital altermagnetic photonic crystal (arXiv:2605.28656). They demonstrate how antiunitary symmetry can enforce momentum-dependent splitting in bosonic systems, providing a physical substrate for complex information routing.
2026-06-01 · 8 min read · briefing
A briefing on Wang, Hiltunen, and Schotland's arXiv:2605.29536 paper: single-photon scattering in arrays of one-way waveguides, where chiral geometry produces light-cone transport and antichiral geometry restores classical-optics-like interference.
2026-05-24 · 5 min read · biology
An exploration of deploying a high-fidelity metagenomic pipeline in a home environment using Oxford Nanopore sequencing and GPU-accelerated bioinformatics on the NVIDIA DGX Spark.
2026-05-22 · 6 min read · briefing
A briefing of Hong & Schotland's (arXiv:2605.22797) first-principles QFT framework for single-photon propagation. They establish a universal fidelity formula across erasure and dephasing channels, and discover a fundamental fidelity floor of 1/2 in the strong coupling limitâcritical bounds for the next generation of quantum routers.
2026-05-14 · 9 min read · new
We followed Apple's four-constraint recipe to the letter, converted a transformer to MLPackage, and got 100% static residency on the first pass. Then we asked the CoreML runtime where it actually ran the ops. 0% on the ANE. Same recipe, scaled to ESM2-class size, scheduler flipped to 100% ANE placement. The post explains why eligibility and placement are different problems, and ships the Swift MLComputePlan tool that distinguishes them without opening Xcode.
2026-05-14 · 8 min read
We tried to run a 1.1 GB vision model in the user's browser. Most users have 16 GB of RAM and four other tabs. This is what worked (Mol* protein rendering, SmolVLM in VR), what broke (Moondream2 as the default, the Cache API on Safari), and the rule we use now: render on the client, infer on the server, in-browser inference only when latency is the constraint and the model fits in ~500 MB. With the OPFS shim and the commit that ripped the WebGPU inference stack.
2026-05-11 · 8 min read
PSP measures the Sun directly; JWST observes other bodies that reflect the Sun. Cross-correlate the two and you can measure â and forecast â the irradiance delivered to specific bodies. First end-to-end pipeline live: 6 cloud workflows, public HF dataset, dashboard at ask-meridian.uk/helio. Honest about the v0.1 data-scale gap.
2026-05-09 · 12 min read
Read Rodney Loudon's Quantum Theory of Light end-to-end to mine ideas for photon-route + meridian. Ten experiments grounded in chapters 3, 5, 6, and 9. Eight came back negative or decorative â squeezing was decorative, photon-number metric strictly weaker than Gaussian fidelity, non-Gaussian heralded states didn't survive the eval scale. One â a g(1) coherence-time feature â shipped to meridian-orbital@3.1.0 with +108% discrimination over what it replaced. Honest accounting with every number.
2026-05-09 · 11 min read
I tried to make Grok run my pharmacy errands end-to-end. The plan: search ââ²' cart ââ²' automated checkout, all chat-driven. The wall: VTEX's reCAPTCHA Enterprise enforces hostname binding server-side â your worker forwards a real captcha token, Google reports the origin doesn't match the site key, VTEX silently drops the email and returns 200 {}. The pivot: anonymous cart in-worker + a /checkout/cart/add URL hand-off to the user's browser. Ships ~95% of the value without a Browserbase-class headless browser.
2026-05-09 · 10 min read · new
A single-tenant finance MCP that lets Grok read my Binance balance from a country Binance geo-blocks. Three layers, each solving exactly one problem: WebAuthn at the door (passkey-bootstrapped OAuth, single-user), Cloudflare Workers in the middle (auth + tools + KV), a tiny Fly proxy through Bright Data's static-residential AR IP at the edge so Binance's whitelist hears from one fixed IP forever. ~
2026-05-07 · 10 min read
A skill-routing classifier had a planet bias â 17 of 18 panel skills got classified as planet. We tried two textbook physics frameworks (Vallado's CRTBP, Sears & Zemansky's spectral classification), neither beat heuristics. Retuned heuristics hit 50% on the panel, then 81% [95% Wilson CI 60%, 92%] on real labelled data. Then we wired an online-SGD loop on top so the classifier improves from every user click â with constant per-request cost and zero local training.
2026-05-07 · 5 min read
Grok's custom MCP connectors take a server URL + an OAuth dance. We just wired Meridian's orbital skill router into it. The architecture, the OAuth values to paste, and the design choice that lets Grok users authorize with one click â no GitHub PAT, no jargon, no setup wizard.
2026-05-06 · 7 min read
We just shipped meridian-mcp 2.0.0 to both registries from a single tag push. The honest tradeoff: anonymous install still requires npm, but for everything else GitHub Packages has earned its slot â auth shared with your code, automatic provenance, free private packages, same registry as your Docker images. The full release workflow + the npm pkg set name rename trick that lets one tarball ship under two names.
2026-05-04 · 8 min read
Most MCP tutorials show npx create-mcp and a Hello-world tool. Real servers in production need auth, per-key quotas, billing, and an upgrade path. Here's the architecture we use for ask-meridian.uk â entirely on Cloudflare's free tier â and the specific gotchas you'll hit.
2026-05-04 · 6 min read
Most RAG systems either retrieve from a static corpus or end-to-end LLM-rank. Meridian does neither. Llama-3.3-70B authors fresh candidates per task; a deterministic JS classifier assigns each a celestial body class (planet/moon/trojan/asteroid/comet/irregular) based on physics-style features. Why the metaphor, why the deterministic step, and where it goes next.
2026-05-04 · 5 min read
Workers AI for embeddings (free tier), Vectorize for semantic search (free tier), AI Gateway for caching + observability (free). The whole stack costs $0 until you cross 100k requests/month. Here's the wiring we use for meridian's RAG layer.