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Selective spin coupling through a single exciton

Nazir, A.; Lovett, B.W.; Barrett, S.D.; Spiller, T.P.; Briggs, G.A.D.

HPL-2004-114

Keyword(s): quantum information; quantum gates; quantum dots; excitons

Abstract: We present a novel scheme for performing a conditional phase gate between two spin qubits in adjacent semiconductor quantum dots through delocalized single electron states, formed through the inter-dot Forster interaction. We consider two resonant quantum dots, each containing a single excess conduction band electron, whose spin embodies the qubit. We demonstrate that both the two-qubit gate, and arbitrary single-qubit rotations, may be realized to a high fidelity with current semiconductor and laser technology. Notes: A. Nazir, B.W. Lovett and G.A.D. Briggs, Department of Materials, Oxford University, Oxford OX1 3PH

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