Floquet Engineering of Quantum Transport through two Driven Impurities
Using oscillating electric fields to control how particles tunnel through obstacles
Physicists discovered that by rapidly switching electric fields around two tiny barriers in a quantum channel, they can trap particles temporarily and control whether they pass through or bounce back. The spacing between the barriers and the strength of the oscillations determine whether particles get stuck in "bound states"—special configurations where they linger far longer than physics normally allows.
This work could enable quantum devices that store and delay light or particles on demand, useful for building quantum computers and sensors. The setup is achievable with cold atoms in laboratory conditions, making it practical to test these ideas experimentally within the next few years.