Can Physicists Make Quantum Entanglement Visible to the Naked Eye?

A pair of quantum entangled photons sure makes a cute couple. Of course, the two might have opposite states--one might be spin up and another spin down, for example--but they promise they'll always stay that way. They're also fiercely loyal, respecting their opposite-spin preferences no matter how long-distance their relationship. (That means that by checking the state of one entangled photon, you can instantly know the state of the other, distant photon, a handy way to "teleport" information.) Unfortunately, because the couple is merely two light particles, their shining example of old romance has been too dim for our eyes to see. Until now. As announced in their recently published Arxiv.org paper, physicists led by Nicolas Gisin at the University of Geneva in Switzerland believe they have found a way to watch this love affair unfold: by boosting the light emitted by one member of a quantum entangled pair, they ...