Optimal Laser-Control of Double Quantum Dots

Physical Review B 77, 85324 - 5 (2008)

Optimal Laser-Control of Double Quantum Dots

E. Räsänen, A. Castro, J. Werschnik, A. Rubio, E. K. U. Gross

Coherent single-electron control in a realistic semiconductor double quantum dot is studied theoretically. Using optimal-control theory, we show that the energy spectrum of a two-dimensional double quantum dot has a fully controllable transition line. We find that optimized picosecond laser pulses generate population transfer at significantly higher fidelities (>0.99) than conventional sinusoidal pulses. Finally, we design a robust and fast charge switch driven by optimal pulses that are within reach of terahertz laser technology.

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http://dx.doi.org/10.1103/PhysRevB.77.085324
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Selected for March 10, 2008 issue of Virtual Journal of Nanoscale Science & Technology.

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