Quantum memory

 作者:兀官背篾     |      日期:2019-03-08 01:19:00
Electronics giant Fujitsu says it has succeeded in making an experimental quantum dot memory device that can store data on an atomic scale. Each 20-nanometre-diameter quantum dot cell is made of indium arsenide surrounded by gallium arsenide. When light from a laser is shone on a cell, electron-hole pairs are generated. Light from a different laser is then shone on the cell to detect the presence or absence of electrons, corresponding to two binary states (see “Take one quantum dot . . .”, New Scientist, 29 August 1998, p 22). Researchers at Fujitsu’s labs in Atsugi say the device packs large amounts of data into a small space: