SÃO CARLOS, Brazil, June 22, 2017 — A transistor based on quantum dots has been developed. The device, which contains micrometric and nanometric parts, can see light, count, and store information within its own structure, removing the need for a complementary memory unit. Researchers produced the transistor by coating a crystal substrate with thin film. On this microscopic substrate, nanoscopic droplets of indium arsenide act as quantum dots, confining electrons in quantized states. 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