“Quantum entanglement, also called the quantum non-local connection, is a property of a quantum mechanical state of a system of two or more objects in which the quantum states of the constituting objects are linked together so that one object can no longer be adequately described without full mention of its counterpart—even if the individual objects are spatially separated in a spacelike manner. The property of entanglement was understood in the early days of quantum theory, although not by that name. Quantum entanglement is at the heart of the EPR paradox developed in 1935. This interconnection leads to non-classical correlations between observable physical properties of remote systems, often referred to as nonlocal correlations.”
Source: wikipedia – Quantum entanglement
“It sounds like a tiebreaker round in a mixed martial arts bout: entanglement sudden death, or ESD. In actuality it is a mysterious phenomenon by which entangled quantum objects—two electrons, for example, whose properties are linked by some instantaneous connection across space—can suddenly break off their relationship.”
“Two particles can become entangled so completely that a change in one immediately affects the other, no matter how far away it is. Until now, scientists have assumed such a marriage would endure forever.
But in a paper published today in the journal Science, two physicists show that entangled particles can suddenly and irrevocably lose their connection, a phenomenon called Entanglement Sudden Death, or ESD.
Even stranger, said Hu, is that suddenly disentangled particles can just as suddenly be reborn.
The hope, however, is that eventually entanglement will lead to breakthroughs in cryptography, computing, even teleportation. The emergence of ESD could be a problem for these fields; permanently losing entangled information while, say, beaming from one place to another, Star Trek-style, would be a big problem, say both Eberly and Hu.”
Source: msnbc.msn.com – Entangled particles face sudden death