Quantum Entanglement - The Weirdness Of Quantum Mechanics

http://www.facebook.com/ScienceReason ... Quantum Mechanics (Chapter 6): Quantum Entanglement - The Weirdness Of Quantum Mechanics.

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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 by Albert Einstein, Boris Podolsky, and Nathan Rosen in 1935. This interconnection leads to non-classical correlations between observable physical properties of remote systems, often referred to as nonlocal correlations.

Quantum mechanics holds that observables, for example spin, are indeterminate until some physical intervention is made to measure an observable of the object in question. In the singlet state of two spin, it is equally likely that any given particle will be observed to be spin-up or spin-down.

Measuring any number of particles will result in an unpredictable series of measurements that will tend to a 50% probability of the spin being up or down. However, the results are quite different if this experiment is done with entangled particles. For example, when two members of an entangled pair are measured, their spin measurement results will be correlated.

Two (out of infinitely many) possibilities are that the spins will be found to always have opposite spins (in the spin-anti-correlated case), or that they will always have the same spin (in the spin-correlated case). Measuring one member of the pair therefore tells you what spin the other member would have if it were also measured. The distance between the two particles is irrelevant.

• http://en.wikipedia.org/wiki/Quantum_entanglement

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Category:

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Tags:

• quantum
• mechanics
• entanglement
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• nonlocal
• connections
• states
• theories
• epr
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• albert
• einstein
• boris
• podolsky
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• rosen
• interconnection
• physical
• properties
• correlations
• spin
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• experiments
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[ObiTrev]

I feel as though I've been drug tripping, the sounds, colors and content moving from large to small, real to unreal, and active to inactive leave me both perplexed, intrigued and above all else in a state of Flux.

[harkinhank]

OKAY JEEVES! SHOW US A LITTLE WEIRD!

[AeonPhoenixZero]

@ObiTrev WOOO!! I'm the 1,200 person to like this!!

[shkotay]

@HelloIAmDaniel See, I still have problems with this. Michio Kaku on another video was talking about quantum teleportation. He said this is done through quantum entanglement (Quantum Revolution 6 of 6), when if you change ONE photon, the other changes instantly, and its not understood how. Thi is more then learing one state and then knowing the other instantly. This might be on a different playing field then what we are talking about, but this process is still freaky lol :D

[shkotay]

@HelloIAmDaniel Yep, Loki helped answer that and cleared it up. QM is hwo the real world REALLY works, and it doesnt work by common sense at all lol :D Thanks though :D I always wondered though if you could change the state of one atom, is the other affected (if thats even possible)? I wonder about this cause QM ppl really seem to be astonished by this, yet it seems basic that if you se a down spn particle, you just know the other is simply up. Seems basic, and no information is transferred.

[HelloIAmDaniel]

@shkotay The spins are NOT flipping up and down. They're just in a state where you can't tell if it's up or down. That's not to say that the spin states already exist, but it is a better analogy to think that the spins are already set but you just don't know which one has what spin.

The reason you're having trouble with this is that you're trying to apply classical logic to quantum systems, they don't work together. In the quantum world you need maths - intuition doesn't help here :p

[LokiClock]

@shkotay Yeah, but someone's saying, "you won't understand it, it won't make sense," and they keep giving the same examples. I hear it and I know it's our knowledge about something we knew nothing about before, so of course it's different, it's new. I don't see the difference between the concepts and saying water is made up of massive amounts of tiny separate objects. That was really new when we first heard it, too. So I don't buy it until I hear it explained fully and don't understand.

[shkotay]

@LokiClock Well the physicists think theres something to it that seems to be a biggers deal lol :D I am not a physicist myself and only have a decent laymans knowledge of this. The hardest thing for almost all of us to get is that the quantum world does not agree with the common sense view of our macro world, and the quantum view is the right one lol. I guess w would have to get one in who does get it clearly to explan it. It seems simple to me, but maybe I am missing something I guess.

[LokiClock]

@shkotay Me too. Apparently the actual calculations really throw you, so that you can't tell that you've obviously made a mistake. I have no experience with it, so I can't say it's a matter of conceptual comfort. David Deutch's quantum computing videos go into this more, and at a certain point the explanation is clear but I still can't see that the depicted computation has the result it does. I can't analyze the result, or predict the result of a slightly different example.

[shkotay]

@LokiClock Kk the states already exist, its just our knowledge of them has to be gained...ty, that helped clear it up some. Makes me wonder why ppl think this is a huge deal then.