Coherent control of interacting electrons in quantum dots via navigation in the energy spectrum

G. MURGIDA, D. A. WISNIACKI, P. TAMBORENEA

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Año: 2007 vol. 99 p. 368061 - 368064

0031-9007

   Quantum control of the wave function of two interacting electrons confined in quasi-one-dimensional double-well semiconductor structures is demonstrated. The control strategies are based on the knowledge of the energy spectrum as a function of an external uniform electric field. When two low-lying levels have an avoided crossing, our system behaves dynamically to a large extent as a two-level system. This characteristic is exploited to implement coherent control strategies based on slow (adiabatic passage) and rapid (diabatic Landau-Zener transition) changes of the external field. We apply this method to reach desired target states that lie far in the spectrum from the initial state.