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03 November 2024
 
  » arxiv » arxiv.0707.0179

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Optimal Laser-Control of Double Quantum Dots
E. Rasanen ; A. Castro ; J. Werschnik ; A. Rubio ; E. K. U. Gross ;
Date 2 Jul 2007
AbstractThe realization of coherent quantum control of a single electron in a double quantum dot is studied theoretically. Using optimal-control theory it is shown that when an uncontrollable harmonic quantum dot is split into two coupled dots, a fraction of the single-electron states become completely controllable by linearly polarized laser pulses. In double dots of realistic sizes, few-picosecond optimal pulses are sufficient to generate transitions at high occupations (>0.99). This opens up possibilities in coherent manipulation of the electron localization in the double dot by refined terahertz quantum-cascade lasers. In contrast with the use of recently suggested sinusoidal waves, the electron transport driven by optimized laser pulses is not sensitive to the interdot distance, nor to the possible anharmonicity of the potential.
Source arXiv, arxiv.0707.0179
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