All Questions
61 questions
14
votes
6
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3k
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What was the need for doing experiments to prove quantum entanglement?
This question comes from someone who is interested in Physics but with no theoretical background.
In 1936, EPR presented the thought experiment which later came to be known and quantum entanglement.
...
- 1,283
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
30
votes
6
answers
33k
views
Bell's theorem for dummies, how does it work?
I've been reading up on theoretical physics for a few years now and I feel like I am starting to get an understanding of particle physics, at least as much as you can from Wikipedia pages. One thing ...
- 473
2
votes
6
answers
420
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EPR paradox: instantaneous vs very fast?
An EPR quantum experiment can be explained by instantaneous collapse of the wave function regardless of the distance separating a pair of entangled particles. But do we have the certainty that the ...
- 1,227
4
votes
6
answers
683
views
Local EPR-experiments with photons in vacuum?
The principle of non-locality states "that an object is influenced directly only by its immediate surroundings." (Wikipedia)
When two entangled particles are measured in an EPR experiment, we ...
- 3,151
28
votes
1
answer
3k
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The choice of measurement basis on one half of an entangled state affects the other half. Can this be used to communicate faster than light?
It is often stated, particularly in popular physics articles and videos about quantum entanglement, that if one measures a particle A that is entangled with some other particle B, then this ...
- 135k
4
votes
4
answers
784
views
Why isn't quantum entanglement just a lack of information?
From this question and answer from joshphysics, I didn't understand one thing, even after reading the comments:
Why should assume that entangled electrons will only "decide" their state after ...
- 1,334
12
votes
2
answers
2k
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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
1
answer
455
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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
9
votes
2
answers
806
views
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
13
votes
10
answers
3k
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Is quantum entanglement mediated by an interaction?
You can get two photons entangled, and send them off in different directions; this is what happens in EPR experiments. Is the entanglement then somehow affected if one puts a thick slab of EM ...
- 3,105