# Tugui Dragos
> Self-taught automation builder learning quantum computing in the open. Verified numbers, real IBM hardware, open source tools.
Public Ghost content for AI and LLM tooling. Use `/llms-full.txt` for consolidated page and post context.
Append `.md` to any post or page URL to get the content in Markdown (for example, `/example-post.md`).

## Pages
- [Who I am](https://tuguidragos.com/about.md) - I am Tugui Dragos. I build automation systems, the layer nobody sees, and I am learning quantum computing in the open, one post at a time.
- [Privacy](https://tuguidragos.com/privacy.md) - Short version: I collect nothing about you. No analytics. No Google Analytics, no Plausible, no Cloudflare Web Analytics. I do not know how many people read this, which posts land, or where you came from. I write it anyway. No cookies. Not one. Open DevTools and look: the site sets nothing, stores…

## Posts
- [Why your qubits forget: decoherence in plain words](https://tuguidragos.com/why-your-qubits-forget-decoherence-in-plain-words.md) - T1 is the qubit falling down, T2 is the phase slipping away. The two clocks that decide how long your circuit gets to run.
- [Qiskit Global Summer School 2026: 4 labs, 473 seconds of real quantum time, 1 badge](https://tuguidragos.com/qiskit-global-summer-school-2026-quantum-excellence-badge.md) - 5 IBM badges came from courses. This one came from 4 labs, a grader, and 473 seconds on real quantum hardware. The whole 2 weeks, logged from my own job history.
- [I ran a Bell state on real IBM quantum hardware](https://tuguidragos.com/i-ran-a-bell-state-on-real-ibm-quantum-hardware.md) - 4096 shots on a real machine: the correlation survived, and just over one percent of the answers came back impossible. Reading the noise.
- [Running a quantum job like an automation pipeline](https://tuguidragos.com/running-a-quantum-job-like-an-automation-pipeline.md) - Build, transpile, run, collect. A quantum job is a pipeline, and if you ship automations you already know most of the shape.
- [I made 58 themes for myself, then measured every colour in them](https://tuguidragos.com/58-vs-code-themes-measured.md) - I change my editor to match my mood, so one theme was never going to be enough. 28 families, dark and light, every colour taken from something real, then measured on the surface it sits on.
- [Relative phase: the invisible engine of quantum](https://tuguidragos.com/relative-phase-the-invisible-engine-of-quantum.md) - Probabilities cannot see it, the next gate can. Global vs relative phase, and the experiment that makes the invisible visible.
- [One circuit, two IBM Quantum error codes: 1506 and 1603](https://tuguidragos.com/ibm-quantum-error-code-1506-1603.md) - 20 identical submissions, 11 of one code and 9 of the other. Which one you get decides whether IBM tells you what is wrong.
- [The tensor product: why 10 qubits means 1024 numbers](https://tuguidragos.com/the-tensor-product-why-10-qubits-means-1024-numbers.md) - One humble operation builds the space that every multi-qubit state lives in, and explains the exponential. Two qubits in, four amplitudes out.
- [I could not find a place to practise Qiskit, so I built one](https://tuguidragos.com/i-built-a-place-to-practise-qiskit.md) - Every Qiskit tutorial I found was written for a version that no longer runs. So I built twenty exercises that check your answer by inspecting the objects your code produces.
- [Entanglement, explained without the spooky](https://tuguidragos.com/entanglement-explained-without-the-spooky.md) - The Bell state in two lines of code, what correlated really means, and why none of it sends messages faster than light.
- [Six defects in a verified n8n node for IBM Quantum](https://tuguidragos.com/six-defects-verified-n8n-node-ibm-quantum.md) - It passed n8n verification with green tests and 98 percent coverage. Then 121 seconds of real QPU time found what none of that could.
- [Quantum gates are just matrices you can run by hand](https://tuguidragos.com/quantum-gates-are-just-matrices-you-can-run-by-hand.md) - X, H, Z and the rotations: applying a gate is multiplying a matrix by a vector. Literally. Worked by hand, then checked in NumPy.
- [Active recall for hard technical subjects](https://tuguidragos.com/active-recall-for-hard-technical-subjects.md) - Rereading feels like progress and barely works. The method that actually retains hard material, and why it feels worse while it works.
- [Complex numbers are the gateway to quantum](https://tuguidragos.com/complex-numbers-are-the-gateway-to-quantum.md) - Multiplying by i is a quarter turn, Euler's formula is the unit circle, and suddenly the imaginary number is the thing you measure.
- [The version trap that cost me an evening (Qiskit 2.x)](https://tuguidragos.com/the-version-trap-that-cost-me-an-evening-qiskit-2-x.md) - execute() is gone, Aer moved out, and the tutorials never got the memo. What is dead in Qiskit 2.x and the modern pattern that replaced it.
- [Measurement is not magic: the Born rule by hand](https://tuguidragos.com/measurement-is-not-magic-the-born-rule-by-hand.md) - Why a quantum result is a probability: amplitude squared, worked on paper and checked in NumPy, one basis at a time.
- [My IBM Quantum node for n8n is now live](https://tuguidragos.com/ibm-quantum-node-for-n8n.md) - Quantum and automation are my two threads. This node is where they meet. It is verified on n8n Cloud now, and installs straight from the canvas.
- [How I use AI as a tutor without letting it lie to me](https://tuguidragos.com/how-i-use-ai-as-a-tutor-without-letting-it-lie-to-me.md) - The best study partner I have ever had is also the most confident liar I have met. The prompts and checks that keep it honest.
- [Running quantum circuits on real IBM hardware from n8n](https://tuguidragos.com/quantum-circuits-ibm-hardware-n8n.md) - I built an open source n8n node for IBM Quantum and ran a Bell state on a real 156-qubit processor. The full loop, the transpilation gotcha, and why n8n.
- [The density matrix: what the state vector misses](https://tuguidragos.com/the-density-matrix-what-the-state-vector-misses.md) - A pure state fits in a vector. A noisy state, or one qubit of an entangled pair, does not. Density matrices, quantum channels, and what they show that vectors miss.
- [Three quantum ways to diagonalise a giant matrix](https://tuguidragos.com/three-quantum-ways-to-diagonalize-a-giant-matrix.md) - A surprising number of hard problems are one eigenvalue problem on a matrix too big to build. Variational, Krylov, sample based, compared.
- [IBM says I understand quantum machine learning now](https://tuguidragos.com/ibm-says-i-understand-quantum-machine-learning-now.md) - Quantum kernels, variational classifiers, and the honest part: what it would take for quantum to beat classical machine learning, and why it has not yet.
- [The Python you actually need for quantum computing](https://tuguidragos.com/the-python-you-actually-need-for-quantum-computing.md) - Dictionaries for counts, just enough OOP to read Qiskit, and NumPy as the bridge. The thin slice that matters, nothing else.
- [A qubit is not a coin under a cup](https://tuguidragos.com/a-qubit-is-not-a-coin-under-a-cup.md) - The superposition myth, taken apart with math you can run. Not a hidden answer waiting to be read, but something stranger and far more precise.
- [I just earned my second IBM Quantum badge, and it says Advanced](https://tuguidragos.com/i-earned-an-advanced-ibm-quantum-badge.md) - My first IBM Quantum badge said Intermediate and it bent my brain. The second one says Advanced. It is about the algorithms that actually run on today's noisy quantum machines, and I am a self-taught builder who was not supposed to get here.
- [I just earned my first IBM Quantum badge and I am not going back](https://tuguidragos.com/i-earned-my-first-ibm-quantum-badge.md) - There is a type of computer that holds every possible answer at once and only picks one when you force it to look. I found it a few weeks ago. I have not slept well since. First IBM Quantum badge earned. The chapter starts here.

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