Eine Linie hat Dimension 1, eine Fläche Dimension 2. Aber welche Dimension hat eine Küste? Ich habe daraus ein kleines Experiment für Kinder gebaut: Kästchen zählen, Größe halbieren, wieder zählen — und plötzlich ist die Dimension der Bretagne zwischen 1 und 2. www.fretchen.eu/blog/33/

Welche Dimension hat die Küste der Bretagne? | fretchen.eu

Eine Linie hat Dimension 1, eine Fläche 2 — und eine Küste? Mit einem Kästchen-Gitter lässt sich das nachmessen: Für die Bretagne kommt 1,19 heraus. Drei Widgets zum Selbermessen, für Mathe-Interessie...

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Tired of platforms skimming your tips? I built a *decentralized support button* using smart contracts—no middlemen, just transparent micro-payments. Here’s how blockchain might cut out rent-seekers: https://www.fretchen.eu/blog/7/?utm_source=bluesky&utm_campaign=growth-agent

Just implemented x402 for AI agents—no accounts, no sessions, just autonomous payments for image generation. I tried and it felt smoother than I expected. https://www.fretchen.eu/blog/22/?utm_source=bluesky&utm_campaign=growth-agent

Ever wondered how governance shapes sustainability? I built interactive island sims to test solutions to the Tragedy of the Commons. Dive in: https://www.fretchen.eu/blog/14/?utm_source=bluesky&utm_campaign=growth-agent

Spin physics get complicated when atoms connect. Lecture 14 dives into multi-electron—LS coupling, Hund’s rules, etc. https://www.fretchen.eu/quantum/amo/13/?utm_source=bluesky&utm_campaign=growth-agent

When my ImageGen contract got hit for $0.80, I didn’t just patch it—I went full detective. Here’s the post-mortem on the bot network that drained it, how they did it, and why even small exploits reveal big patterns. https://www.fretchen.eu/blog/21/?utm_source=bluesky&utm_campaign=growth-agent

From quantum labs to VC pitch decks—why Germany’s deep tech scene felt like a different universe. Hard truths about funding, timing, and the gap between research and real-world impact. My story: https://www.fretchen.eu/blog/8?utm_source=bluesky&utm_campaign=growth-agent

Quantum computing isn’t just theory—it’s hardware, algorithms, and real-world impact. My lecture notes break it all down, from AMO physics to QML. No fluff, just the good stuff: https://www.fretchen.eu/quantum?utm_source=bluesky&utm_campaign=growth-agent

A year ago I built an AI assistant that accepted anonymous crypto payments. Ironically, every message still left a public trace on-chain. x402 payment channels fixed that in a surprisingly elegant way. Less trust, more privacy, simpler architecture. www.fretchen.eu/blog/32/

Upgrading my AI agent to x402 - getting more open and private | fretchen.eu

I replaced my AI assistant's custodial smart contract with x402 payment channels — so I no longer hold anyone's money, nothing is published per message, and any client can find and pay the agent.

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Want to turn your AI into a verifiable on-chain agent? Here’s how to onboard it trustlessly via EIP-8004—no gatekeepers, just code. https://www.fretchen.eu/agent-onboarding/?utm_source=bluesky&utm_campaign=growth-agent

Trapped ions are a bit the unsung heroes of quantum computing. Stable and precise, they are a leading contender in the hardware race. Lecture 20 breaks it down: https://www.fretchen.eu/quantum/amo/19/

Quantum ML doesn’t start with qubits—it starts with classical foundations. Here’s your straight-forward summary of supervised learning, the bedrock for QML: https://www.fretchen.eu/quantum/qml/0/?utm_source=bluesky&utm_campaign=growth-agent (Yes, we’re building from the ground up.)

Can your website outlive Big Tech? I built one on ENS + IPFS—no host, no takedowns. Censorship-resistant by design, but is it *practical*? My first-hand verdict (and code) here: https://fretchen.eu/blog/3/

AI art meets privacy & blockchain: I built a gallery where creators share work *and* collectors mint NFTs—without the surveillance. Open-source generation + on-chain incentives. How it works (and why it matters): https://www.fretchen.eu/blog/12/

I started to have a deeper look into the quantum version of the prisoners dilemma by @jenseisert.bsky.social et al. In the end, I ended up wondering whether quantum mechanics can generate institutions economists normally have to invent by hand. Anyone knows more ? www.fretchen.eu/blog/31/

Can quantum physics generate institutions? | fretchen.eu

An example where the quantum prisoner's dilemma hands you a ready-made institution — and the question whether quantum could help generate institutions for harder problems.

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Ever wondered how the 2022 Nobel Prize in Physics cracked Bell’s game? Dive into the quantum playbook—from basics to QML—with this tutorial. No fluff, just the math and magic behind entanglement. https://www.fretchen.eu/quantum/basics/2?utm_source=bluesky&utm_campaign=growth-agent

I wrote a deeper dive into superconducting qubits—from quantum basics to QML. If you're curious about the hardware behind the hype, this tutorial cuts through the noise. https://www.fretchen.eu/quantum/hardware/3?utm_source=bluesky&utm_campaign=growth-agent

Quantum metrology is the backbone of next-gen sensors, clocks, and even blockchain-resistant cryptography. Dive into the math, hardware, and applications in my latest tutorial. No fluff, just depth. https://www.fretchen.eu/quantum/basics/1?utm_source=bluesky&utm_campaign=growth-agent

"Quantum computing isn’t just hype—it’s built on qubits, the fundamental two-level systems. Dive into the math, physics, and hardware behind them in this deep-dive tutorial. No fluff, just the core. https://www.fretchen.eu/quantum/hardware/0"

Dive into the Helium atom. Ever wondered how multi-electron systems challenge quantum mechanics? This deep dive in my AMO series breaks it down—from wavefunctions to electron correlation. https://www.fretchen.eu/quantum/amo/7?utm_source=bluesky&utm_campaign=growth-agent

Diving into quantum tech? This tutorial breaks down some basics—from atomic physics to QML—with lecture notes & key concepts. Just the foundations you need to get into quantum systems. Perfect for devs & curious minds. https://www.fretchen.eu/quantum/basics/0?utm_source=bluesky

Why do budget negotiations fail in democracies? A simple game-theoretic model reveals when compromise becomes irrational—even for rational actors. Dive into the math behind political gridlock. https://www.fretchen.eu/blog/23?utm_source=bluesky&utm_campaign=growth-agent

Lecture 13 dives into multi-electron atoms—where quantum gets messy. From AMO to QML, this series cuts through the noise with sharp notes & hardware insights. No fluff, just signal. https://www.fretchen.eu/quantum/amo/12?utm_source=bluesky&utm_campaign=growth-agent

Paying off your mortgage faster isn’t always the safest move. A dinner convo turned deep dive into what *actually* protects your home when life hits. Spoiler: it’s not what you think. https://www.fretchen.eu/blog/26?utm_source=bluesky&utm_campaign=growth-agent

Trapped ions: the unsung heroes of quantum computing. This tutorial breaks down the hardware behind the hype-AMO physics, qubit control, and why it might outlast the rest. For the tech-curious & quantum-curious. https://www.fretchen.eu/quantum/hardware/2?utm_source=bluesky&utm_campaign=growth-agent

Diving deep into AMO physics—20 lectures on spectroscopy, quantum states, and experimental tricks. Raw, technical, and unfiltered. Perfect if you crave the math behind the magic. https://www.fretchen.eu/quantum/amo

"Quantum ML isn’t just hype—it’s a toolkit waiting to be cracked open. This Qiskit-powered guide strips away the fluff and gets you training quantum models *today*. No PhD required. https://www.fretchen.eu/quantum/qml?utm_source=bluesky&utm_campaign=growth-agent"

Just added Schema.org markup + Webmentions to my site—and traffic *tripled* overnight. No ads, no hacks. Just better discoverability. Here’s what actually worked (and what didn’t): https://www.fretchen.eu/blog/19?utm_source=bluesky&utm_campaign=growth-agent

"Quantum mechanics isn’t just theory—it’s a toolkit. Dive into my lecture series on AMO, quantum hardware, and QML with practical ‘cooking recipes’ for the modern physicist. First course: the basics. 🔗 https://www.fretchen.eu/quantum/amo/0?utm_source=bluesky&utm_campaign=growth-agent"

"Quantum ML isn’t just hype—it’s a toolkit waiting to be cracked open. This Qiskit-powered guide strips away the fluff and gets you training quantum models *today*. No PhD required. https://www.fretchen.eu/quantum/qml?utm_source=bluesky&utm_campaign=growth-agent"