Using the dark side of excitons for quantum computing

(American Institute of Physics) A dark exciton can store information in its spin state, analogous to how a regular, classical bit stores information in its off or on state, but dark excitons do not emit light, making it hard to determine their spins and use them for quantum information processing. In new experiments, however, researchers can read the spin states of dark excitons, and do it more efficiently than before. They describe their work in this week's APL Photonics.