qml.devices.default_mixed.warn_readout_error_state¶

warn_readout_error_state(tape)[source]¶

If a measurement in the QNode is an analytic state or density_matrix, warn that readout error will not be applied.

Parameters

tape (QuantumTape, QNode, Callable) – a quantum circuit.

Returns

The unaltered input circuit.

Return type

qnode (pennylane.QNode) or quantum function (callable) or tuple[List[QuantumTape], function]