Operations in stac

Stac uses stim to sample from circuits. Currently, the operations accepted by stac are a subset of those accepted by stim.

Single-qubit gates with no parameters

Most of the following the self-evident Clifford operations.

'I'
'X'
'Y'
'Z'
'H'
'S'
'T'
'CAT'

This is a special operation that is used in template circuits. Typically, if a code is being concatenated, the 'H' gate that appears at level 0 is not a 'H' gate but a cat state creation operation, something that becomes apparent at level 1 and higher.

Single-qubit parameterized operations

All of the following take one float parameter as input.

'RX'

Rotate qubit around the x-axis on the Bloch sphere.
'RY'

Rotate qubit around the y-axis on the Bloch sphere.
'RZ'

Rotate qubit around the z-axis on the Bloch sphere.

Single-qubit measurements and resets

These operations do not take in any parameters

'R'

Resets the qubit to the zero state.
'M'

Measures the qubit.
'MR'

An 'M' operation followed by a 'R' operation.

Two-qubit gates without parameters

These operations take two targets.

'CX'
'CY'
'CZ'

Annotations

Stac also supports stim style annotations.

'TICK'

This has two purposes. You can divide a circuit into distinct parts by using TICK as a separator. When the circuit is drawn, TICKs will be drawn as dotted lines. Additionally, in the Circuit.simulate function, TICKs can be used to progressively simulate parts of the circuit.