Here is a bit more background on this concept:

In entanglement, as physicists explain it, two or more particles are linked such that any change in one will simultaneously cause a change in the other, even if they are far apart, whether by thousands of miles or thousands of light years.

And below is a video explaining the famous “double slit experiment” which seems to whow quantum entanglement with one photon in anf of itself or two depending how you interpret:

Sometimes called the “two-slit” or “Young’s” experiment, it demonstrates that matter and energy can display the characteristics of both waves and particles, establishing the principle known as wave-particle duality. Furthermore, it questions the role of the observer in the outcome of events and demonstrates the fundamental limitation of an observer to predict experimental results.

Enjoy this unusual science!

thanks to techtimes.com for the great info