Description: In the field of quantum computing, ‘Ancilla’ refers to a qubit that is used as an aid in quantum calculations, especially in the context of error correction. Unlike qubits that store primary information, ancilla qubits are used to facilitate operations and enhance the fidelity of quantum calculations. These auxiliary qubits allow for the detection and correction of errors that may arise during the processing of quantum information, which is crucial given that quantum systems are highly susceptible to external interference and noise. The implementation of ancilla qubits is fundamental for the development of robust and efficient quantum algorithms, as they help maintain quantum coherence and ensure that the results of calculations are accurate. In summary, ancilla qubits are essential components in the architecture of quantum computing, playing a key role in error correction and improving the stability of quantum systems.