Scientists find 'spooky' quantum entanglement on incredibly tiny scales — within individual protons
"With evidence that quarks and gluons are entangled, this picture has changed. We have a much more complicated, dynamic system."
Scientists have used high-energy particle collisions to peer inside protons, the particles that sit inside the nuclei of all atoms. This has revealed for the first time that quarks and gluons, the building blocks of protons, experience the phenomenon of quantum entanglement.
Entanglement is the aspect of quantum physics that says two affected particles can instantaneously influence each other's "state" no matter how widely separated they are — even if they are on opposite sides of the universe. Albert Einstein founded his theories of relativity on the notion that nothing can travel faster than the speed of light, however, something that should preclude the instantaneous nature of entanglement.
As a result, Einstein was so troubled by entanglement he famously described it as "spukhafte Fernwirkung" or "spooky action at a distance." Yet, despite Einstein's skepticism about entanglement, this "spooky" phenomenon has been verified over and over again. Many of those verifications have concerned testing increasing distances over which entanglement can be demonstrated. This new test took the opposite approach, investigating entanglement over a distance of just one quadrillionth of a meter, finding it actually occurs within individual protons.
