: an aid to achieving or mastering something difficult
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With Alice and Bob’s approach, adding a single logical ancilla is a low-cost affair that can significantly boost logical performance.—Ameya Paleja, Interesting Engineering, 21 Jan. 2026 Each logical qubit gets encoded into three qubits, and ancilla qubits check to see if one of the phases has flipped.—Katie McCormick, Quanta Magazine, 16 Nov. 2021