  Although entanglement is widely recognized as one of the most fascinating
characteristics of quantum mechanics, nonlocality remains to be a big
labyrinth. The proof of existence of nonlocality is as yet not much convincing
because of its strong reliance on Bell's theorem where the assumption of
realism weakens the proof. We demonstrate that entanglement and quantum
nonlocality are two equivalent aspects of the same quantum wholeness for
spacelike separated quantum systems. This result implies that quantum mechanics
is indeed a nonlocal theory and lays foundation of understanding quantum
nonlocality beyond Bell's theorem.
