Simulator

Quantum Circuit Simulator

Build a circuit, run it, and read the state — all computed in your browser.

H selected — tap or click a wire, or Tab into the grid and use the arrow keys, then press Enter, to place it. Enter, Delete, or tapping a placed gate removes it.

Pick a gate, then tap a cell — or Tab into the grid and use the arrow keys and Enter — to place it.

Shots

Noise0.0%Simulates decoherence on real hardware

Presets

Press Run to sample this circuit.

State inspector

Phase disks

Each disk is one qubit: the filled area is its chance of reading 1, the needle points at the phase of its |1⟩ component, and the ring fades as entanglement mixes the qubit.

Per-qubit

q00.0%separable · 0.00
q10.0%separable · 0.00

P(1) is the chance this qubit reads 1; entropy is 0 when it stands alone and 1 when it is maximally entangled with the rest.

State

State	Amplitude	Prob.
\|00⟩	1.000	100.0%
\|01⟩	0.000	0.0%
\|10⟩	0.000	0.0%
\|11⟩	0.000	0.0%

OpenQASM 3

Export

OPENQASM 3.0;
include "stdgates.inc";

qubit[2] q;
bit[2] c;


c = measure q;

Import

Save & share

local storage

Place at least one gate to save.

Your circuits0 / 10 saved

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Export notebook

A ready-to-run Jupyter notebook of this circuit — open it in Colab or your own environment. Built in your browser; nothing leaves this page.