Very interesting article from Wall street journal.
Excerpt 1:
When two photons get "entangled" they behave like a joint entity. Even when they're miles apart, if the spin of one particle is changed, the spin of the other instantly (10,000 times fast than speed of light) changes, too. This direct influence of one object on another distant one is called non-locality.
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Excerpt 2:
In 1990, the English physicist Lucien Hardy devised a thought experiment. The common view was that when a particle met its antiparticle, the pair destroyed each other in an explosion. But Mr. Hardy noted that in some cases when the particles' interaction wasn't observed, they wouldn't annihilate each other. The paradox: Because the interaction had to remain unseen, it couldn't be confirmed.
In a striking achievement, scientists from Osaka University have resolved the paradox. They used extremely weak measurements -- the equivalent of a sidelong glance, as it were -- that didn't disturb the photons' state. By doing the experiment multiple times and pooling those weak measurements, they got enough good data to show that the particles didn't annihilate. The conclusion: When the particles weren't observed, they behaved differently.
WGN comments: The particle-antiparticle pair like little beauty (Mermaid?). She enjoys being on the beach (naked?). You are allowed to peek her remotely, but if you get too close, she dives into the sea.
Enjoy:
http://online.wsj.com/article/SB124147752556985009.html
Excerpt 1:
When two photons get "entangled" they behave like a joint entity. Even when they're miles apart, if the spin of one particle is changed, the spin of the other instantly (10,000 times fast than speed of light) changes, too. This direct influence of one object on another distant one is called non-locality.
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Excerpt 2:
In 1990, the English physicist Lucien Hardy devised a thought experiment. The common view was that when a particle met its antiparticle, the pair destroyed each other in an explosion. But Mr. Hardy noted that in some cases when the particles' interaction wasn't observed, they wouldn't annihilate each other. The paradox: Because the interaction had to remain unseen, it couldn't be confirmed.
In a striking achievement, scientists from Osaka University have resolved the paradox. They used extremely weak measurements -- the equivalent of a sidelong glance, as it were -- that didn't disturb the photons' state. By doing the experiment multiple times and pooling those weak measurements, they got enough good data to show that the particles didn't annihilate. The conclusion: When the particles weren't observed, they behaved differently.
WGN comments: The particle-antiparticle pair like little beauty (Mermaid?). She enjoys being on the beach (naked?). You are allowed to peek her remotely, but if you get too close, she dives into the sea.
Enjoy:
http://online.wsj.com/article/SB124147752556985009.html
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