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Optically Driven Spin Based Quantum Dots for Quantum Computing - Research Area 6 Physics 6.3.2

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Technical Report,01 Oct 2008,30 Sep 2015

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University of Michigan - Ann Arbor United States

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This program conducted experimental and theoretical research aimed at developing an optically driven quantum dot quantum computer, where, the qubit is the spin of the electron trapped in a self-assembled quantum dot in InAs. Optical manipulation using the trion state 2electrons and a hole allows for fast psec rotations of the electron spin. The program achieved several milestones summarized in the annual reports. In this reporting period, we discovered the nuclear spin quieting first discovered in 2008 is present in vertically coupled quantum dots but includes an unexpected role of nonlocal nuclear spin quieting. The final reporting period shows the first measured narrowing of the hyperfine field distribution resulting from the nuclear spin quieting. Considerable insight into the physical origin of the nuclear quieting was made in theory that also expanded our understanding of the physics of coupled quantum dots and ways to incorporate this system into a quantum network.

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