AncillaQubit

class qiskit.circuit.AncillaQubit(register=None, index=None)

Bases: Qubit

A qubit used as ancillary qubit.

Creates a qubit.

Parameters

• register (QuantumRegister) – Optional. A quantum register containing the bit.
• index (int) – Optional. The index of the bit in its containing register.

Raises

CircuitError – if the provided register is not a valid QuantumRegister