Quantum Circuit Lab
A web-based quantum computing laboratory for building circuits, simulating quantum states, and visualizing quantum algorithms. Features interactive circuit builder with Bloch sphere visualization.
About Quantum Circuit Lab
Drop quantum gates onto a circuit, hit simulate, and watch how qubit states evolve in real time. Quantum Circuit Lab lets you build circuits from scratch using standard gates — Hadamard, CNOT, Pauli rotations — then inspect the results through a live Bloch sphere that rotates as each gate is applied. It's hands-on in a way that textbook diagrams rarely are.
The app is aimed at students and curious minds who want to go beyond reading about superposition and entanglement and actually see what those concepts look like mathematically. No installation required — everything runs in the browser, sourced from an open MIT-licensed project. It sits squarely in education, though it leans closer to a physics tool than a guided course.
If you enjoy visual representations of scientific concepts, Graphing Calculator goes in a different direction but shares the same spirit of plotting abstract math into something you can see and manipulate. A larger screen helps here because the circuit builder and Bloch sphere display side by side, and on a small screen one or the other gets squeezed.
Look inside
How to use
• Drag gates from the toolbar onto the circuit grid to build quantum circuits • Use left mouse button to place gates, right click to remove them • Click "Run Simulation" to execute your circuit and see results • View state vectors, probabilities, and Bloch sphere visualizations in real-time • Try pre-built algorithm demos like Grover's Search or Quantum Fourier Transform • Adjust qubit count (1-8 qubits max due to browser memory limits) • Export your circuits as code for Qiskit, Cirq, or Q# This simulator uses classical computation to model quantum states. Each qubit doubles memory requirements, so 8+ qubits may slow performance. The tool visualizes quantum superposition and entanglement through mathematical simulation, not actual quantum hardware. Select algorithms from the demo library to see famous quantum circuits in action, or build custom circuits to explore quantum gate effects on state evolution.
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