catalyst.pauli_measure¶

pauli_measure(pauli_word: str, wires, postselect: int | None = None) → DynamicJaxprTracer[source]¶

A qjit() compatible Pauli-product mid-circuit measurement for PennyLane/Catalyst.

Important

The qp.pauli_measure() function is not QJIT compatible under the legacy tracing pathway; use catalyst.pauli_measure() instead.

Parameters:

pauli_word (str) – The Pauli word (e.g. "XZ") acting on wires.
wires (int or list[int]) – Wire(s) the Pauli product applies to.
postselect (Optional[int]) – Optional postselection (not yet supported in compilation).

Returns:

A JAX tracer for the classical measurement outcome (boolean).

Raises:

NotImplementedError – If postselect is set (not yet plumbed through MLIR).
ValueError – If the number of wires does not match the Pauli word length.

code/api/catalyst.pauli_measure

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