Optically driven nanostructures as the basis for large-scale quantum computing

Abstract

We propose a large-scale quantum computer architecture based upon the regular arrays of dopant atoms implanted into the semiconductor host matrix. The singly-ionized pairs of donors represent charge qubits on which arbitrary quantum operations can be achieved by application of two strongly detuned laser pulses. The implementation of two-qubit operations as well as the qubit read-out utilize the intermediate circuit containing a probe electron that is able to shuttle along the array of ionized ancilla donors providing the indirect conditional coupling between the qubits. The quantum bus strategy enables us to handle the qubits connected in parallel and enhances the efficiency of the quantum information processing. We demonstrate that non-trivial multi-qubit operations in the quantum register (e.g., an entanglement generation) can be accomplished by the sequence of the optical pulses combined with an appropriate voltage gate pattern.