Cold atoms act as messengers at a distance

Cold atoms act as messengers at a distance

Particles can interact directly by repelling or attracting each other. But how do particles that are far apart interact? In a paper published by Nature on April 3, researchers at the University of Chicago report that atoms can exchange information using intermediary particles. This is the first time the phenomenon has been observed…

Researchers use light to create a one-way street for mechanical energy

Researchers use light to create a one-way street for mechanical energy

Is it possible to create a “one-way street” for mechanical energy that only allows heat and sound to flow in one direction? In most standard set-ups, this is impossible: if acoustic energy can flow in one direction, then it can also flow in the reverse direction. Finding new ways to break this basic symmetry has sparked the interest of…