Decoherence by Correlated Noise and Quantum Error Correction

Details Decoherence by Correlated Noise and Quantum Error Correction Decoherence by Correlated Noise and Quantum Error Correction

2005-08-30

arxiv.org/abs/quant-ph/0508228v2

Phys. Rev. Lett. 97, 040501 (2006).

Physics

Quantum Physics

4 pages, 1 figure, Phys. Rev. Lett. in press

Scientific paper

10.1103/PhysRevLett.97.040501

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.

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