The paper reports that reusing ancilla qubits for both X and Z stabilizers in alternating sub-rounds cuts rotated surface code qubit overhead by about 25%, with simulations suggesting comparable performance at higher distances.
V on Neumann, Mathematical foundations of quantum mechanics: New edition
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Quantum Prometheus: Defying Overhead with Recycled Ancillas in Quantum Error Correction
The paper reports that reusing ancilla qubits for both X and Z stabilizers in alternating sub-rounds cuts rotated surface code qubit overhead by about 25%, with simulations suggesting comparable performance at higher distances.