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Electronic ‘Etch A Sketch’ may boost quantum design

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An innovative system, which works rather like a child’s Etch A Sketch toy, could significantly speed the design of quantum electronic devices. The intricate circuits needed can be “drawn” on a surface using tiny spots of charge, adjusted, and then scrubbed out with a flash of light. Rolf Crook and colleagues at Cambridge University, UK, who developed the technique, have already built minute electrical circuits that they are using to study quantum effects. These include nanowires, point contacts - narrow junctions between reservoirs of charge - and isolated islands of charge called quantum dots.

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