Been learning quantum on the side for months. What tripped me up wasn't the math — it was how often "canonical" circuits from papers and tutorials fail quietly. Broken Hamiltonians. Reversed bit orders. Silent API drift.
So I built a personal library where every circuit is checked against its reference output before it's listed. 50+ curated circuits across Qiskit, PennyLane, and Cirq. No signup required.
QubitHub's quantum circuit library is open to browse — https://qubithub.co?utm_source=mastodon&utm_medium=social&utm_campaign=m25-library-open
50+ curated circuits (Qiskit, PennyLane, Cirq). Every one audited against its reference output. No signup required to browse — readable URLs like https://qubithub.co/qubithub/grover-search?utm_source=mastodon&utm_medium=social&utm_campaign=m25-library-open , no UUIDs.
Sign-up's open. Creating circuits is invite-only for now (drop me a line after sign-up). In-browser execution is coming next.
Writing my first quantum computing experiments (simulated only for now, using IBM Qiskit). It’s great to be collaborating again with my former undergraduate research advisor and his students... Almost 20 years after graduation. Some light academic work makes me very happy. One day I’ll still go back and finish my Master’s... I've dropped out twice, third time's the charm :)
https://www.ibm.com/quantum/qiskit
#QuantumComputing #Qiskit #Academia #Research #Tech #ContinuousLearning
Updated: I added the aha-chapter that I was missing.
"Quantum computers try all possibilities in parallel" is the popular line — and it's dangerously misleading. A measurement collapses everything to one random answer, so "parallel" on its own is useless.
The actual move: a quantum algorithm is ONE global linear transformation on a 2^n-amplitude vector, designed so wrong answers destructively cancel and the right one amplifies. Classical searches. Quantum shapes.
Walkthrough with a Grover-style bar chart in four snapshots, plus the full pipeline: superconducting oscillator → Josephson junction → Bell state → amplitude amplification → Shor / Grover / simulation.
🔗 https://ki-mathias.de/en/quantum-computing.html
🎥 https://youtu.be/iMaqNfA0Gs0 (9:14, HD)
📦 Qiskit notebooks: https://github.com/pmmathias/quantum-computing
#quantumcomputing #qiskit #qubit #interference #grover #blochsphere #physics #education
Circuit spotlight: Quantum Teleportation
Transfers an unknown quantum state between qubits using a shared Bell pair and 2 classical bits.
Alice entangles her message with her half, measures, sends 2 bits to Bob. Bob applies X/Z corrections to reconstruct the state.
No FTL. Original destroyed. Entanglement consumed.
Explore it → https://qubithub.co/circuits/e99b8b75-b2fd-47b7-a7d1-ad786ae177c5
Circuit spotlight: VQE — H₂ Ground State
Parameterized quantum circuit + classical optimizer → molecular ground-state energy.
For H₂: 2 qubits, 4 parameters, converges to -1.137 Hartree — near the exact FCI/STO-3G result. Only 2 measurement bases needed (ZZ and XX).
Explore it → https://qubithub.co/circuits/2e744d85-c706-4926-98a5-05877f318eb4
Circuit spotlight: Grover's Search (1996)
Finds a marked item in an unsorted database with quadratic speedup — O(√N) queries instead of O(N).
For 2 qubits: 1 oracle query, 1 diffusion step, 100% success on a simulator. One iteration is all this special case needs.
Oracle flips a phase. Diffusion amplifies it. Interference does the rest.
Explore it on QubitHub → https://qubithub.co/circuits/478a76af-df90-4fad-9ee2-ab6ee8e6ce0a
Circuit spotlight: Bell State
Creates |Φ+⟩ = (|00⟩ + |11⟩)/√2 — the simplest entangled state.
Two gates. Two qubits. One of quantum mechanics' deepest phenomena.
2 qubits • Qiskit • Entanglement
Run it in your browser — no install, no account needed.
量子×クラウドはなぜ難しい？第4の壁：量子クラウドの待ち行列問題
https://qiita.com/imh1104/items/84dd7d5dee9884a008fa?utm_campaign=popular_items&utm_medium=feed&utm_source=popular_items
Квантовые вычисления как инженерная проблема: почему «превосходство» не означает применимость
Когда в 2019 году была опубликована работа группы исследователей Google о так называемом квантовом превосходстве, само выражение почти мгновенно вышло за пределы научного контекста и стало частью популярного нарратива о скором вытеснении классических вычислений. Между тем, уже в оригинальной публикации речь шла о строго определённой задаче - выборке из распределения, искусственно сконструированного таким образом, чтобы затруднить классическое моделирование.
https://habr.com/ru/articles/1012450/
#квантовые_вычисления #суперпозиция #кубит #алгоритм_шора #qiskit #квантовые_технологии #квантовые_алгоритмы #квантовые_компьютеры #квантовый_компьютер #квантовый
nandan
QubitHub
Anthony Accioly
KI-Mathias
Qiita - 人気の記事
Habr