In a 1935 publication, Albert Einstein, Boris Podolsky, and Nathan Rosen present a thought experiment meant to demonstrate the apparent absurdity of quantum entanglement, which appeared to be in direct opposition to a fundamental law of the world. It was obvious to the men who created quantum mechanics in the decade of 1920, that quantum entanglement is unsettling because of the fact that quantum superposition is a real phenomenon. Thomas Vidick, a professor of physics, says it may be alluring to believe that the particles are somehow interacting with each other across such vast distances. A key resource for quantum networks is entanglement, a fundamental aspect of quantum theory that enables the sharing of unbreakable quantum connections between distant participants. Distributing entanglement across distant items that can act as quantum memory is very important. This has been accomplished in the past employing systems like warm and cold atomic vapours, single atoms and ions, and flaws in solid-state system
Part of the book: Quantum Entanglement in High Energy Physics