Entanglement is the strange, ghostly phenomenon in which quantum particles share the same existence (actually, the same wave function). So a measurement on one instantaneously influences the other, no matter how far apart they might be.
So-called action-at-a-distance lies at the heart of many of modern physic's most dramatic new technologies: quantum cryptography, quantum teleportation and quantum computation all rely on it.
That makes entanglement important stuff.
"Stuff" is the way many physicists are beginning to think of entanglement: as a resource, rather like water or energy, to be called upon when needed in the new quantum world. These physicists want to be able to create entanglement, use it and store it whenever they need to.
The first two of these--creating and using entanglement--has been the subject of intense research for the last 30 or 40 years. But the ability to store entanglement in a useful way has eluded physicists. Until now.
Today, Christoph Clausen and buddies at the University of Geneva demonstrate not only how to store entanglement but how to release it again in fully working order.
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"Obviously, something analogous to this operates in the human brain and possibly in other parts of the living system. Nature has used this trick as a key to life in my intuitive opinion. This is not enough, we also need signal nonlocality in violation of orthodox quantum physics that is a limiting case just like special relativity is a limiting case of general relativity." -- Jack Sarfatti