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Țugui Dragoș

I build automation systems and I am teaching myself quantum computing in public. Honest proof of work from zero: the math, the Qiskit, the noise on real machines.

13 Posts May 2026 First post Jul 2026 Latest

Posts

  1. 19:14 Quantum Computing

    Complex numbers are the gateway to quantum

    Multiplying by i is a quarter turn, Euler's formula is the unit circle, and suddenly the imaginary number is the thing you measure.

  2. 14:11 Quantum Computing

    The version trap that cost me an evening (Qiskit 2.x)

    execute() is gone, Aer moved out, and the tutorials never got the memo. What died in Qiskit 2.x and the modern pattern that replaced it.

  3. 22:33 Quantum Computing

    Measurement is not magic: the Born rule by hand

    Why a quantum result is a probability: amplitude squared, worked on paper and checked in NumPy, one basis at a time.

  4. 17:51 Milestones

    My IBM Quantum node for n8n is now live

    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.

  5. 05:20 Quantum Computing

    How I use AI as a tutor without letting it lie to me

    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.

  6. 06:26 Milestones

    Running Quantum Circuits on Real IBM Hardware from n8n

    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.

  7. 15:38 Milestones

    The density matrix: what the state vector misses

    A pure state fits in a vector. A noisy or entangled one does not. Density matrices, quantum channels, and what they show that vectors miss

  8. 09:38 Milestones

    Three quantum ways to diagonalize a giant matrix

    A surprising number of hard problems are one eigenvalue problem on a matrix too big to build. Variational, Krylov, sample based, compared

  9. 19:03 Milestones

    IBM Says I Understand Quantum Machine Learning Now

    Quantum kernels, variational classifiers, and the honest part: when quantum beats classical machine learning, and when it does not.