New form of light: Newly observed optical state could enable quantum computing with photons
(PHYSorg.com Physics)

Try a quick experiment: Take two flashlights into a dark room and shine them so that their light beams cross. Notice anything peculiar? The rather anticlimactic answer is, probably not. That`s because the individual photons that make up light do not interact. Instead, they simply pass each other by, like indifferent spirits in the night.