  We analyze the performance of the Resonator/zero-Qubit (RezQu) architecture
in which the qubits are complemented with memory resonators and coupled via a
resonator bus. Separating the stored information from the rest of the
processing circuit by at least two coupling steps and the zero qubit state
results in a significant increase of the ON/OFF ratio and the reduction of the
idling error. Assuming no decoherence, we calculate such idling error, as well
as the errors for the MOVE operation and tunneling measurement, and show that
the RezQu architecture can provide high fidelity performance required for
medium-scale quantum information processing.
