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We study the error rate of CNOT operations in the Kane solid state quantumcomputer architecture. A spin Hamiltonian is used to describe the system.Dephasing is included as exponential decay of the off diagonal elements of thesystem's density matrix. Using available spin echo decay data, the CNOT errorrate is estimated at approsimately 10^{-3}.Comment: New version includes substantial additional data and merges two old  figures into one. (12 pages, 6 figures

Error rate of the Kane quantum computer controlled-NOT gate in the presence of dephasing