Perfect phosphorus component

A working transistor based on a single phosphorus atom precisely placed in a silicon crystal is not only an incredible feat of engineering, but could represent another step towards the building blocks of a so-called quantum computer. According to a team at the University of New South Wales, Australia, the tiny transistor uses as an individual phosphorus atom patterned between atomic-scale electrodes and electrostatic control gates as its active component. The electronic characteristics of the device match theoretical predictions made by Gerhard Klimeck’s group at Purdue University in the US.