It is amazing we are getting an understanding of events that occur on the attosecond time scale.

interestingengineering.com - Birth time of quantum entangled electrons measured

Billionth of a billionth of a second: Quantum entanglement ‘birth time’ clocked

Quantum entanglement is one of the most perplexing phenomena in physics. This bizarre concept proposes that two particles become linked, and any change to one causes an “instantaneous” change in the other, even if they are separated by vast distances.

Prima facie, this concept challenges the laws of classical physics, and until now, the exact process of how this entanglement arises has been shrouded in mystery.

“You could say that the particles have no individual properties, they only have common properties. From a mathematical point of view, they belong firmly together, even if they are in two completely different places,” explained Prof. Joachim Burgdörfer from the Institute of Theoretical Physics at TU Wien.

It is in this context that researchers at TU Wien in Vienna have made a big stride. Working with colleagues in China, they have achieved a breakthrough in understanding the phenomenon of quantum entanglement, in a world first.
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..... more spooky action at the link