Publications [#245105] of Harold U. Baranger

Papers Published
  1. Novais, E; Baranger, HU, Decoherence by correlated noise and quantum error correction., Physical Review Letters, vol. 97 no. 4 (July, 2006), pp. 040501 [16907555], [doi] .

    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.