2005/08/31 by E. Novais, Harold U. Baranger · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevlett.97.040501
published as Phys. Rev. Lett. 97, 040501 (2006). · 4 pages, 1 figure, Phys. Rev. Lett. in press
arxiv created 2006/07/24 · arxiv updated 2009/12/01
We 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.