Rice sized laser a step forward for quantum-computing

Researchers at Princeton University believe that they have taken a major step toward quantum computing by creating a microwave laser or maser. The maser is a rice grain-sized laser powered by single electrons from artificial atoms called quantum dots.
It was the quantum dots, and not lasers, that the researchers were originally interested in exploring. Quantum dots act like single atoms, as components for quantum computers.
 http://natmonitor.com/2015/01/16/rice-sized-laser-a-step-forward-for-quantum-computing