A pulse of light sets the tempo in the material. Atoms in a crystalline sheet just a few atoms thick begin to move—not ...

For thousands of years, thinkers argued about whether light is made of particles or waves. At the beginning of the 20th century, scientists realized it was both: massless particles and waves. An even ...

Physicists have succeeded in "entangling" more than two photons for the first time. A Canadian team has entangled three photons while an Austrian team have created a four-photon entangled state. The ...