Mohamed Hatifi

Physicists made a diamond speck with a special defect work as a laser for sound. Under light and microwaves, energy flowed into rhythmic oscillations. The process required a tiny excess of excited states — just a couple percent. The discovery promises ultra-sensitive sensors and the chance to observ

A stationary detector is 'blind' to light direction. But once it starts moving uniformly, the Doppler effect shifts the frequency of oncoming and receding photons. If the detector is color-selective, it begins to favor one direction. This quantum property paves the way for simple orientation sensors