Four-wave mixing A weak optical signal (red) from a spacecraft transmitter can be amplified noise-free when it encounters two pump waves (blue and green) in a receiver on Earth. (Courtesy: Chalmers ...

Creators across TikTok have thoughts about a movement to wear blue friendship bracelets that arose after the election. Cosmo ...

In space exploration, long-distance optical links now enable the transmission of images, videos, and data from space probes to Earth using light. However, for these signals to travel the entire ...