Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
low-degree graphs with flag qubits Chamberland, Zhu, Yoder, Hertzberg, Cross https://arxiv.org/abs/1907.09528 https://journals.aps.org/prx/abstract/10.1103/PhysRevX.10.011022 The IBM researchers evaluated two approaches: Heavy hexagon code. 57 physical qubits per logical qubit. Heavy square code.