They are two entangled photons, separated by many kilometers.
When one is affected, the other switches its spin with a time latency 100,000 times less than the speed of light, if light was somehow otherwise communicating the change.
These sorts of statements, and the whole article is filled with them, are futile. They are an attempt to provide a classical heuristic for Quantum Kinematics, i.e. Quantum Laws, which are beyond the reach of classical conception.
... and what is this? Physics night?