Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
Topological and subsystem codes on 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 It could simply be that d = 5 is just optimal for convenient presentation in academic