Quantum computation with doped silicon cavities

We propose a quantum computer architecture involving substitutional donors inphotonic-crystal silicon cavities and the optical initialization, manipulation,and detection processes already demonstrated in ion traps and other atomicsystems. Our scheme considerably simplifies the implementation of the buildingblocks for the successful operation of silicon-based solid-state quantumcomputers, including positioning of the donors, realization of one- andtwo-qubit gates, initialization and readout of the qubits. Detailedconsideration of the processes involved, using state-of-the-art values for therelevant parameters, indicates that this architecture might lead to errors pergate compatible with scalable quantum computation.