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We present a composite pulse controlled phase gate which together with a busarchitecture improves the feasibility of a recent quantum computing proposalbased on rare-earth-ion doped crystals. Our proposed gate operation is tolerantto variations between ions of coupling strengths, pulse lengths, and frequencyshifts, and it achieves worst case fidelities above 0.999 with relativevariations in coupling strength as high as 10% and frequency shifts up toseveral percent of the resonant Rabi frequency of the laser used to implementthe gate. We outline an experiment to demonstrate the creation and detection ofmaximally entangled states in the system.Comment: 6 pages, 4 figure

Robust quantum gates and a bus architecture for quantum computing with rare-earth-ion-doped crystals