Asymmetric-coupled vertical quantum dots (ACVQD) - Towards Light controlled quantum gate

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In this project we propose the realization of a laterally and vertically positioned triple dot structure consisting of an asymmetric double dot structure (ADQD) and a single dot (larger than the ADQD). The triple dot structure serves as a quantum gate with the ADQD as source dot and the large dot as target dot. The coupling between source and target is achieved by light induced dipole fields originating from the ADQD already observed in asymmetric double quantum wells (ADQW) [1]. With respect to the state of the art proposals [2] where static fields are applied to get the function of a quantum gate here optical addressing via light induced Stark effect also observed in quantum wells (QW) and in quantum well wires (QWW) [1] is proposed to extend the state of the art. To obtain the function both the vertical and the lateral position and size of the triple dot structure must be controlled in the nanometer range.