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The inevitable existence of static internal imperfections and residualinteractions in some quantum computer architectures result in internaldecoherence, dissipation, and destructive unitary shifts of active algorithms.By exact numerical simulations we determine the relative importance and originof these errors for a Josephson charge qubit quantum computer. In particular wedetermine that the dynamics of a CNOT gate interacting with its idleneighboring qubits via native residual coupling behaves much like a perturbedkicked top in the exponential decay regime, where fidelity decay is only weaklydependent on perturbation strength. This means that retroactive removal of gateerrors (whether unitary or non-unitary) may not be possible, and that effectiveerror correction schemes must operate concurrently with the implementation ofsubcomponents of the gate.

Manifold algorithmic errors in quantum computers with static internal imperfections