2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142225I give an overview of the basic concepts behind quantum error correction and quantum fault tolerance. This includes the quantum error correction conditions, stabilizer codes, CSS codes, transversal gates, fault-tolerant error correction, and the threshold theorem.8 pages, to appear in Encyclopaedia of Mathematical PhysicsQuantum Physicstext