Page "Quantum entanglement" Paragraph 1

According to the Copenhagen interpretation of quantum mechanics, their shared state is indefinite until measured.

Quantum entanglement is a form of quantum superposition.

When a measurement is made and it causes one member of such a pair to take on a definite value ( e. g., clockwise spin ), the other member of this entangled pair will at any subsequent time be found to have taken the appropriately correlated value ( e. g., counterclockwise spin ).

Thus, there is a correlation between the results of measurements performed on entangled pairs, and this correlation is observed even though the entangled pair may have been separated by arbitrarily large distances.