Spin Transfer over Molecular Bridges

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Science  22 Aug 2003:
Vol. 301, Issue 5636, pp. 1013
DOI: 10.1126/science.301.5636.1013c

Quantum dots are attractive for spin-based quantum information processing because their spins can be fairly well protected from the dissipative effects of the environment and can thus have relatively long spin lifetimes. Most of the techniques for coupling quantum dots have been limited to ones that work at cryogenic temperatures or that use fabrication techniques that are not readily scalable. Ouyang and Awschalom (p. 1074; see the 1 August news story by Service) report on a self-assembly technique in which layers of quantum dots are coupled by conjugated molecules. Spins excited in one quantum dot were coherently transferred over the molecular bridges. This hybrid of molecular and spin electronics establishes a promising route toward a scalable architecture for coherent quantum information processing.

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