2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/102512We study the decoherence of a quantum computer in an environment which is inherently correlated in time and space. We first derive the nonunitary time evolution of the computer and environment in the presence of a stabilizer error correction code, providing a general way to quantify decoherence for a quantum computer. The general theory is then applied to the spin-boson model. Our results demonstrate that effects of long-range correlations can be systematically reduced by small changes in the error correction codes.4 pages, 1 figure, Phys. Rev. Lett. in pressQuantum PhysicsMesoscale and Nanoscale Physicstext