Quantum Computing, Fault Tolerance, Error Correction, Logical Qubits.
https://arxiv.org/abs/quant-ph/9811052v1 2004 — Universal Quantum Computation with ideal Clifford gates and noisy ancillas — Bravyi and Kitaev https://arxiv.org/abs/quant-ph/0403025 2005 — Operator Quantum Error Correcting Subsystems for Self-Correcting Quantum Memories — Bacon