Control¶
The Control tile is a standalone control point you can drag onto a wire and connect to another gate - the general-purpose way to build a custom controlled version of any gate, not just the built-in CNOT and Toffoli.
| Qubits | 1 (per control point placed) |
| Parameters | None - it takes on whatever gate it's connected to |
| Changes the quantum state? | Only via the gate it controls |
| Also called | Control point |
What it does¶
Where CNOT and Toffoli are pre-built controlled-X gates, the standalone Control tile lets you add a control condition to any gate - for example, a controlled-Z, a controlled-H, or a controlled rotation - by placing the control dot on one wire and connecting it to the gate you want controlled on another wire. The connected gate only applies when the control qubit is \( |1\rangle \), exactly like the control half of a CNOT.
Example¶
Dragging a Control point onto q[0] and connecting it to a Z gate on q[1] builds a controlled-Z - a gate not otherwise in the default catalog.
Related¶
- CNOT - a built-in controlled-X
- Toffoli - a built-in, two-control controlled-X
- Controls and conditionals