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.

#QuantumComputing #Qiskit #PennyLane

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

#QuantumComputing #Qiskit #QuantumAlgorithms

Circuit spotlight: QAOA — MaxCut

Variational quantum approach to NP-hard graph optimization.

Partitions a 4-node graph to maximize cut edges. Cost operator uses ZZ interactions; mixer uses X rotations.

For 3-regular graphs at p=1: worst-case guarantee ~0.692 (Farhi et al., 2014).

Explore it → https://qubithub.co/circuits/6915d62d-a518-42f9-89f6-482a1283818b

#QuantumComputing #Optimization #QuantumAlgorithms

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

#QuantumComputing #QuantumChemistry #Qiskit

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

#QuantumComputing #Qiskit #QuantumAlgorithms

I audited 50 quantum circuits across Qiskit, PennyLane, and Cirq.

Most ran. Some were wrong. The H2 VQE had an incorrect Hamiltonian coefficient — the optimized energy still looked plausible. 3 PennyLane circuits broke after a NumPy update. A 4th timed out from manual finite differences.

QubitHub: 50 curated circuits with verified outputs and version-tracked deps. Run in your browser — no install needed.

Full write-up: https://qubithub.co/blog/auditing-50-quantum-circuits

#QuantumComputing

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.

→ https://qubithub.co

#QuantumComputing #Qiskit #Entanglement

QubitHub — a free platform for quantum computing.

Run circuits across Qiskit, PennyLane & Cirq in your browser. Zero setup.

→ 50+ curated circuits
→ Fork, star, modify
→ CLI coming soon

Try the demo → join the beta waitlist.

qubithub.co

#QuantumComputing #Qiskit #PennyLane #Cirq