Entanglement Swapping

Entanglement swapping is a process in quantum physics where two particles that haven't directly interacted become entangled through a shared connection with other entangled particles. Imagine two pairs of entangled particles. By performing a specific measurement on one particle from each pair, the remaining two particles—initially unconnected—become entangled. This process effectively "swaps" the entanglement, creating a link between particles that never directly interacted. It’s a key technique for quantum communication and networks, enabling secure data transfer over long distances by extending entanglement chains without physical connection between the end points.