Coherent manipulation of electronic States in a double quantum dot

We investigate coherent time evolution of charge states (pseudospin qubit) in a semiconductor double quantum dot. This fully tunable qubit is manipulated with a high-speed voltage pulse that controls the energy and decoherence of the system. Coherent oscillations of the qubit are observed for severa...

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Bibliographic Details
Published in:Physical review letters 2003-11, Vol.91 (22), p.226804-226804, Article 226804
Main Authors: Hayashi, T, Fujisawa, T, Cheong, H D, Jeong, Y H, Hirayama, Y
Format: Article
Language:English
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Summary:We investigate coherent time evolution of charge states (pseudospin qubit) in a semiconductor double quantum dot. This fully tunable qubit is manipulated with a high-speed voltage pulse that controls the energy and decoherence of the system. Coherent oscillations of the qubit are observed for several combinations of many-body ground and excited states of the quantum dots. Possible decoherence mechanisms in the present device are also discussed.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.91.226804