H-VEC converts any classical repetition code into a quantum error-correcting protocol by adding one qubit and post-processing to project noise onto correctable Y-errors, yielding exponential suppression under code-capacity noise and quadratic qubit savings in fault-tolerant lattice surgery.
QuESTlink—Mathematica embiggened by a hardware- optimised quantum emulator.Quantum Science and Technology, 5(3):034012, may 2020
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Correcting quantum errors using a classical code and one additional qubit
H-VEC converts any classical repetition code into a quantum error-correcting protocol by adding one qubit and post-processing to project noise onto correctable Y-errors, yielding exponential suppression under code-capacity noise and quadratic qubit savings in fault-tolerant lattice surgery.