We investigate coherent time-evolution of charge states (pseudo-spin 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.
@article{arxiv.cond-mat/0308362,
title = {Coherent manipulation of electronic states in a double quantum dot},
author = {Toshiaki Hayashi and Toshimasa Fujisawa and Hai-Du Cheong and Yoon-Ha Jeong and Yoshiro Hirayama},
journal= {arXiv preprint arXiv:cond-mat/0308362},
year = {2009}
}