Free Quantum computing lab (Qiskit): Build quantum circuits, see how qubits behave and run Qiskit code in your browser.

A quantum computing lab that runs entirely in your browser. Drag gates onto qubits in a circuit composer and watch the exact probabilities, the statevector with its phases, a Bloch sphere for every qubit and random shot counts update as you build. Step through a circuit one gate at a time, turn on realistic noise (gate errors, T1 relaxation, T2 dephasing, readout errors) and see what it does. Twelve guided experiments show how quantum systems behave: superposition, measurement collapse, the Born rule, interference, measurement bases, entanglement, GHZ states, decoherence, teleportation, Deutsch-Jozsa and Grover search. Then write real Qiskit code (QuantumCircuit, StatevectorSampler, Statevector, AerSimulator, noise models, fake IBM backends, plot_histogram) in a Python notebook. Everything is simulated on your device; it does not connect to quantum hardware.

Free, no login, nothing to install. Your work stays in this browser.

What you can do

• Drag and drop gates (H, X, CNOT, rotations, Toffoli, swap, measure…) and see results live
• Read probabilities, amplitudes and phases, and a Bloch sphere per qubit, step by step
• Add noise and see decoherence and readout errors in the shot counts
• Run Qiskit code in a notebook and switch between code and the composer

Graded, AI-assisted versions live in the Quantum Computing course.