Quantum physics testing EPR for real

Testing the EinsteinPodolskyRosen experiment for real in Geneva Switzerland.

Category:

Science & Technology

Tags:

• quantum physics
• epr
• albert einstein

[louisdvanniekerk]

@shim2dawg

Man, but you are a clever individual...not.

@DuTux91

1. Measurements made with atomic clocks that hold true time i.e. no sychronization necessary. Comparison afterwould showed simultaneous responses.

2. Paired electrons always have an opposite spin. Similarly here, the "state", you refer to is the spin.

[DaTux91]

@1 Even atomic clocks can't be synchronized exactly. But if they measured the states at distant enough places, the minor deviation wouldn't be significant. So scratch that remark.

@2 I know that, but they used photons not electrons. My question however, is not what states they're talkin' about. It's about the actual result.

Let's say they DID use electrons, did they find that they had the same spin? Or some exotic state? (spin 0 instead of + or - 1/2) I'd just like to know the actual results.

[louisdvanniekerk]

From my understanding, it was spin that was measured and each photon was fired of in a way to select + or - spin and the result was that the opposite of the pair ALWAYS showed the opposite spin. Interestingly they induced spin change (don't know how and if it was that) but essentially state-change. Sometime the opposite of the pair would react to this before it was done to the other i.e. in anticipation. Stuart Hameroff has a theory about the information flow - see his consciousness series.

[DaTux91]

I'd like to know how they think they measured it at the exact same time... Additionally, I'd like to know what the outcome WAS. What did they find that they could conclude that the fotons didn't "know" in what state they were? Did they find that they were the same? Or that they weren't there? Or that they were in some other unknown state? Questions that arise when you watch this video and that are not answered at all. On the contrary, they're not even mentioned.

[adicosoi]

why should we think that the photons don't have any characteristics when created. I know the story about the Double Slit experiment, and the thing about measurement, but to proof what they what to proof i think the should interact somehow with 1 photon and them measure them. Otherwise this looks like an experiment of the conservation of impulse to me, the one with the gun. As the gun and the bullet get opposite impulses when separated so does the to photons.

[jude4021]

What series/programme is this from? I'd like to see the rest of it.

[modelmark]

@DaTux91 what is knowledge of a photon or 'nature' anyway. 'Exactly the same' is also not compliant with Heisenberg's uncertainty, which is the corner stone of their own theory.

If you read about the Bell experiment they determine that they are truly random during flight because of the statistical properties on detection. If it is 50% spin in one direction and 50% spin in another direction, they are right.

[modelmark]

@shim2dawg because it is more showman ship and PR than science?

[modelmark]

Still doubtful about this. It could still be that the photons have this property when they left their source and do not communicate. The claim that they are really random is at least here not made.

"nature itself does not know" is a philosophically flaky statement. What does knowledge mean for nature?

"they left at exactly the same moment". Heisenberg's uncertainty forbids the statement of 'exactly the same moment' being verifiable.

[shim2dawg]

@DaTux91 ,,, presumably they used synchronized clocks with an agreed upon time to trigger the experiment...

relativistic corrections for the clocks perhaps were necessary, easy enough to do

[shim2dawg]

wtf... why does it follow him on a bike for 5 minutes?