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.

Date Published: 29 April 2008
PDF: 17 pages
Proc. SPIE 7023, Quantum Informatics 2007, 70230M (29 April 2008); doi: 10.1117/12.801920

Published in SPIE Proceedings Vol. 7023:
Quantum Informatics 2007
Yuri I. Ozhigov, Editor(s)