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Angle-dependent decoherence of charge qubits in free-standing slabs
Ying-Yen Liao1, Yueh-Nan Chen, Sheng-Rui Jian
1Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan. yyliao@nuk.edu.tw
Abstract:
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.
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