
The Photon, the Quantum Dot, and the 270-Meter Miracle That Just Brought the Quantum Internet One Giant Leap Closer
Two university buildings in Rome, separated by 270 meters of open air, a busy street, and the accumulated atmospheric chaos of an ancient city. In one building, a quantum dot—a semiconductor particle small enough to be governed by the strange laws of quantum mechanics—emitted a single photon. In the other building, a second quantum dot, physically different from the first, waited. What happened next, measured by instruments sensitive enough to detect the polarization state of a single particle of light, was something no one had ever done before: the quantum state of the first photon was teleported to the second, across the open-air gap, without either photon ever physically crossing the space between them.


