Solid-state silicon NMR quantum computer

A solid-state quantum computer composed entirely of semiconductor silicon is proposed. Qubits are nuclear spins, I = 1/2, of Si-29 stable isotopes in the form of atomic chains embedded in a nuclear-spin free matrix of Si-28 stable isotopes. Each Si-29 nuclear spin in a chain can be accessed selectively with a different resonant frequency (rf) due to a large magnetic field gradient created by a nearby micromagnet, i.e., unitary operations needed for quantum computing can be performed by fine tuning of the rf. Ensemble readout of qubits from 10(5) copies of the atomic chain is accomplished by magnetic resonance force microscopy.