Drawing a quantum computer
Abstract
The setup could form the basis of a scalable solid-state quantum computer.QDs provide an ideal way of achieving the isolation between an electron's spin and external influences that is required for quantum computation.But, until now, there has been no reliable means of transferring spin in and out of QDs.The UCSB researchers use a controlled, layer-by-layer, bottom-up approach to create structures consisting of CdSe QDs bridged by conjugated molecules.The structure is built up on a silica substrate functionalized with amine or thiol groups.When immersed in a CdSe QD solution, the first monolayer forms.The QD ligands are then modified to form thiol end groups.The process is repeated to build up a threedimensional structure of CdSe QDs linked together by the dithiol conjugated molecules.Simply changing the QD solution during the fabrication process allows a multilayer structure to be created.In this case, Ouyang and Awschalom used two differently sized CdSe QDs.All-optical spin resonance methods reveal spin transfer between the QDs at room temperature, with an efficiency of 20%.Various mechanisms have been proposed to explain spin coupling, but the researchers suggest an alternative.They believe that the dithiol conjugated molecules binding the CdSe QDs together allow spin 'communication'.The delocalized π-orbitals of the thiol molecules allow spin carrier transport between the dots.They could serve as a means for transferring quantum information and could be a step towards…
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