FreeQuantumStore

random qubits → BB84 key exchange → XOR encryption. Three steps, one secure message.

True quantum randomness from superposition. Password generator, dice, cards. Chi-squared test vs Math.random().

Find H2 ground state energy. 2D energy landscape heatmap, animated gradient descent, bond length potential curve.

3-qubit bit-flip and phase-flip codes. Inject errors, watch syndrome detect + correct. Monte Carlo 1000-trial analysis.

Quantum cryptography protocol. Alice sends qubits, Bob measures. Add Eve eavesdropper — see 25% error rate prove interception.

Reconstruct an unknown qubit state from measurements in X/Y/Z bases. See density matrix and fidelity converge.

Full quantum circuit editor — place H/X/Y/Z/S/T/CNOT/M gates, see state vector + probabilities. Up to 6 qubits, 100-shot sampling.

Step-by-step teleportation protocol. Create Bell pair, Alice measures, Bob corrects. Full 3-qubit state vector at each step.

First proof of quantum speedup. Determine if f(x) is constant or balanced in ONE query vs 2^(n-1)+1. Up to 5 qubits (32 inputs).

3D qubit visualization — apply gates, see state vector + probabilities. Drag to orbit. Keyboard shortcuts for all gates.

Interactive gate reference — matrix, Bloch rotation, before/after states, properties for 10 standard gates.

Bell pair experiment with 100-shot statistics. Create, measure, see perfect correlation. Particle effects.

Amplitude amplification visualized. 2-6 qubits, adjustable target, auto-run, measurement. Classical vs quantum comparison.

Chat with a quantum computing AI tutor. SmolLM runs in your browser via WebGPU. 11 pre-built answers as fallback.

Find hidden period string in O(n) quantum queries vs O(2^n) classical.

Apply QFT, see frequency domain. Phase coloring, measurement probabilities.

Find hidden bit string in 1 query. Classical needs N. Animated comparison.

Estimate eigenvalue of a unitary. Precision increases with qubits. Foundation for Shor.

Send 2 classical bits using 1 qubit + entanglement. Step-by-step protocol.

Classical vs quantum walk with custom coin operators (Hadamard, Grover, custom unitary). Animated probability histograms, spreading-over-time plot, coin comparison mode.

Parameterized quantum circuit learns to classify 2D data. Variational ansatz with gradient descent, real-time decision boundary, multiple data presets.

3-qubit bit-flip, phase-flip, and Shor 9-qubit codes. Introduce errors, visualize syndrome measurement and correction step by step with ancilla qubits.

VQE for H2, LiH, HeH+ or custom Hamiltonians. Hardware-efficient, UCCSD, and HVA ansatze. Adam/GD/SPSA optimizers, convergence plot, energy landscape, parameter trajectory.

BB84 protocol: Alice prepares qubits, Bob measures, Eve eavesdrops. Basis comparison, error rate detection, full protocol animation with qubit states.

Side-by-side classical vs quantum optimization. Draw energy landscapes, watch tunneling escape local minima. 50-trial success rate comparison.

Modified tic-tac-toe where moves create superpositions. Cycles cause entanglement collapse. Learn measurement, entanglement, and collapse by playing.

Quantum Fourier Transform for 2-5 qubits. Animated gate-by-gate execution, phasor diagrams, classical DFT comparison. Applications: period finding, phase estimation.