Applications
Entanglement has many applications in quantum information theory. With the aid of entanglement, otherwise impossible tasks may be achieved.
Among the best-known applications of entanglement are superdense coding and quantum teleportation.
Most researchers believe that entanglement is necessary to realize quantum computing (although this is disputed by some).
Entanglement is used in some protocols of quantum cryptography.
In interferometry, entanglement is necessary for surpassing the standard quantum limit and achieving the Heisenberg limit.
Read more about this topic: Quantum Entanglement