Quantum error correction of coherent errors by randomization
Institut für Angewandte Physik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
2 Laboratoire de Physique Théorique, UMR 5152 du CNRS, Université Paul Sabatier, 31062 Toulouse Cedex 4, France
Corresponding author: a firstname.lastname@example.org
Published online: 4 January 2005
A general error correction method is presented which is capable of correcting coherent errors originating from static residual inter-qubit couplings in a quantum computer. It is based on a randomization of static imperfections in a many-qubit system by the repeated application of Pauli operators which change the computational basis. This Pauli-Random-Error-Correction (PAREC)-method eliminates coherent errors produced by static imperfections and increases significantly the maximum time over which realistic quantum computations can be performed reliably. Furthermore, it does not require redundancy so that all physical qubits involved can be used for logical purposes.
PACS: 03.67.Lx – Quantum computation / 03.67.Pp – Quantum error correction and other methods for protection against decoherence / 05.45.Mt – Quantum chaos; semiclassical methods
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005