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 ²⁹Si stable isotopes in the form of atomic chains embedded in a nuclear-spin free matrix of ²⁸Si stable isotopes. Each ²⁹Si 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 10⁵ copies of the atomic chain is accomplished by magnetic resonance force microscopy.