All Questions
61 questions
9
votes
2
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806
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Can observations of entangled particles affect their unobserved counterparts?
There are two experiments that are often used to explain Quantum Mechanics: the two-slit experiment and the EPR paradox. I am curious what would happen if you combined them.
Imagine an experiment ...
- 191
12
votes
2
answers
2k
views
EPR-type experiments and faster-than-light communication using interference effects as signaling mechanism
I understand that faster-than-light communication is impossible when making single measurements, because the outcome of each measurement is random. However, shouldn't measurement on one side collapse ...
- 7,488
0
votes
3
answers
493
views
Why does a violation of locality not imply a violation of relativity?
This question is closely related to: What counts as information?
Taking the specific example, again, of the EPR experiment. I think everyone agrees on the following:
The act of measuring the ...
4
votes
1
answer
1k
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Some applications of the Einstein-Podolsky-Rosen (EPR) paradox?
If you were to explain the Einstein-Podolsky-Rosen paradox to high school students (age 16, with no particular strength in math), what kind of intuitive example would you provide to make things ...
- 141
-1
votes
1
answer
111
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Since photons do not experience time (nor distance in that case), why did Einstein think it was "spooky action at a distance"? [closed]
A photon travels at c, so it experiences no time or distance. I imagine from the photon's perspective, it's rather just like a simple dot on some kind of 4D manifold. So it begs the question of why ...
- 464
0
votes
1
answer
412
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How does this youtube video demonstrate quantum entanglement? [closed]
The following is an experiment that shows "spooky action at a distance" of quantum entanglement; that is, when we measure some properties of two entangled photons, we find that measuring property of ...
- 300
-2
votes
1
answer
119
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QM explanation on entanglement for spin and the original EPR experiment
I have read this:
http://en.wikipedia.org/wiki/EPR_paradox#Mathematical_formulation
and this:
How does non-commutativity lead to uncertainty?
But it does not give me a specific explanation on the ...
- 29.3k
-4
votes
1
answer
56
views
How to understand the claim that ''positions'' of entangled particles are correlated? [closed]
Are both particles detected in the exact same spot of the detector? Something else?
- 3
2
votes
2
answers
191
views
Why can't be the EPR experiment simplified?
Alice measures the spin of her electron on the x axis. She now knows the spin value of Bob's electron on the x axis at time T0. Bob measures the spin of his electron on the z axis. He now knows the ...
- 147
0
votes
1
answer
455
views
Relativity and Entanglement
Say we have two particles which are entangled so that they have opposite spins. If one is up, the other is down. They are sent off to two spatially separated observers A and B. Both observers can ...
- 1,114
2
votes
0
answers
93
views
EPR Experiments and Monogamy
Normally in an EPR experiment two measurements are performed on entangled particle pair. Only the particle pair is treated quantum mechanically and it is usually prepared in a state like
$$ (\,\left|\...
- 3,540