| Autor: |
Liao YY; Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan. yyliao@nuk.edu.tw, Chen YN, Jian SR |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2010 Feb 03; Vol. 22 (4), pp. 045301. Date of Electronic Publication: 2010 Jan 05. |
| DOI: |
10.1088/0953-8984/22/4/045301 |
| Abstrakt: |
We investigate the decoherence of a charge qubit in a double quantum dot which is formed in a free-standing semiconductor slab. The dots are spatially arranged to align along a particular direction. Confined phonons in the slab have a remarkable influence on the dynamics of a qubit system. We show that the decoherence of such a qubit strongly depends on the positions of the dots. By varying the tunnel coupling, the decoherence differs significantly in laterally and vertically coupled quantum dots. A robust qubit is further achieved due to suppression of electron-phonon coupling. Moreover, the coherent evolution of the system is analyzed by modulating the interdot direction. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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