Quantum entanglement: Difference between revisions

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imported>Meg Taylor
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imported>Boris Tsirelson
 
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#REDIRECT [[Entanglement (physics)]]
'''Entanglement''' is a phenomenon in [[quantum mechanics]] by which two seemingly different systems can be inextricably linked.
It is at the heart of the [[EPR paradox]] and the source of the phrase "spooky action at a distance" that is often attributed to Einstein.
It is also the mechanism that allows [[quantum teleportation]] to be a reality.
Entanglement is purely quantum mechanical; no true analog exists in the classical world.
Despite this it is not too hard to invent fictional classical systems that behave as though entangled, for pedagogical purposes.
 
One of the most common analogies is to imagine a pair of coins that are normal in every way except that
after you have flipped either one you will know ''with 100% certainty'' what the other will land on
when you decide to flip it, regardless of how long you wait to flip the second or how far apart
the coins are when flipped.

Latest revision as of 02:36, 1 October 2010