Quanta in a spin does compute

It's no quantum leap, but a small, giant step has been taken by David Press of Stanford University, California and colleagues there and at the National Institute of Informatics, in Tokyo, Japan, towards a quantum computing system. A basic requirement for quantum information processing systems is the ability to completely control the state of a single qubit. Press and his colleagues have now manipulated and measured a semiconductor qubit approximately 100 times faster than was possible with earlier techniques using a method for rotating the qubit spin using polarized light pulses. The experiment has "pushed quantum dots up to speed with other qubit candidate systems to ultimately build a quantum computer," Press says.