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Home > News > Optical pumping of a single hole spin in a quantum dot

January 25th, 2008

Optical pumping of a single hole spin in a quantum dot

Abstract:
The spin of an electron is a natural two-level system for realizing a quantum bit in the solid state1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16. For an electron trapped in a semiconductor quantum dot, strong quantum confinement highly suppresses the detrimental effect of phonon-related spin relaxation1, 2, 3, 4, 5, 6, 7. However, this advantage is offset by the hyperfine interaction between the electron spin and the 104 to 106 spins of the host nuclei in the quantum dot. Random fluctuations in the nuclear spin ensemble lead to fast spin decoherence in about ten nanoseconds8, 9, 10, 11, 12, 13, 14. Spin-echo techniques have been used to mitigate the hyperfine interaction14, 15, but completely cancelling the effect is more attractive. In principle, polarizing all the nuclear spins can achieve this16, 17 but is very difficult to realize in practice12, 18, 19. Exploring materials with zero-spin nuclei is another option, and carbon nanotubes20, graphene quantum dots21 and silicon have been proposed.

Source:
nature.com

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