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Photons are sticking together like never before. The individual photons that make up a beam of light normally do not interact, but a team of researchers have clumped three together for the first time, creating a new form of light.
Usually, when you cross two beams of light, they simply pass straight through one another. But Aditya Venkatramani at Harvard University, Sergio Cantu at the Massachusetts Institute of Technology, and their colleagues found a way to make photons stick together. On a small scale, this means that the two light beams would merge into …