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Phase disk marker

Phase disk marker tool tile from the Operations catalog

The phase disk tile isn't a gate either - it's a visualization tool. Clicking it inserts a snapshot marker on the circuit that displays each qubit's phase at that exact point.
Qubits All qubits at the chosen point in the circuit
Parameters None
Changes the quantum state? No
Also called Phase disk snapshot

What it does

Selecting this tool and clicking a point on the circuit inserts a dashed vertical divider with one small disk per qubit wire, colored to show that qubit's phase at that moment - using the same Phase color wheel as the Q-Sphere and Statevector panels. It's a way to "freeze" and inspect phase information at a specific step, without needing those panels open.

Example

See Phase disks for a full walkthrough, including how the disk's appearance changes as you add S and T gates before the snapshot point.

  • Phase disks - including a worked Bell-state example, both before and after adding measurement gates
  • Circuit - where to find the phase disk tool while building a circuit