One of Einstein's thought experiments had to do with quantum entanglement, which he called "spooky action at a distance." Imagine you have a two-sided coin that you can easily split in half.

He used a thought experiment to compare the force felt ... or if the elevator is being pushed toward your feet. Einstein stated that the two forces are actually identical. Furthermore, if you ...

In 1935, Einstein, Podolsky and Rosen discovered 'entangled states' — strongly correlated quantum states between two particles ... to the ideal 'gedanken (thought) experiment'.

In 1935, Einstein, Podolsky, and Rosen stirred controversy with a thought experiment in which two particles of common ... enable the identification of photon pairs from the same atom.