Optically-controlled logic gates for two spin qubits in vertically-coupled quantum dots

Details Optically-controlled logic gates for two spin qubits in vertically-coupled quantum dots Optically-controlled logic gates for two spin qubits in vertically-coupled quantum dots

2006-09-05

arxiv.org/abs/cond-mat/0609094v3

Phys. Rev. B 75, 125317 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 3 figures; expanded for clarity + minor changes, J-ref added

Scientific paper

We describe an interaction mechanism between electron spins in a vertically-stacked double quantum dot that can be used for controlled two-qubit operations. This interaction is mediated by excitons confined within, and delocalized over, the double dot. We show that gates equivalent to the SQRT-SWAP gate can be obtained in times much less than the exciton relaxation time and that the negative effects of hole-mixing and spontaneous emission do not seriously affect these results.

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