Circuit Builder
Free-form circuit building — pick a qubit count, every gate is available immediately, and noise is one click away. No sequence, no locks.
Qubit count
Wires
Circuit sequence
No operations yet — add gates below.
Add single-qubit gate
System type
Isolated
Open
Noise channel
How noise is modeled here at n>1. The joint state above is always the exact pure-state evolution. With Open switched on, we additionally trace out every qubit except the one you pick and apply the noise channel to that qubit's reduced description — the same math F5 uses, just aimed at one qubit inside a bigger register. It's not a full multi-qubit open-system simulation (that engine doesn't exist yet); it's an honest, engine-accurate approximation.