All Questions
11 questions
28
votes
1
answer
3k
views
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
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
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
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
17
votes
6
answers
1k
views
What counts as information?
What counts as information? In e.g. the EPR experiment why is one entangled particle knowing instantaneously the state of the other not counted as 'information'.
Edit
Following a discussion in the ...
2
votes
2
answers
386
views
What is the local, non-realist explanation of EPR correlations?
Bell's theorem proves that local hidden variables theories cannot reproduce quantum mechanics (with the exception of superdeterministic theories). Are there any local theories that do not involve ...
- 815
14
votes
6
answers
3k
views
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
13
votes
10
answers
3k
views
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
4
votes
3
answers
458
views
Many Worlds locality and EPR experiment
I've read in Sean Carroll's book (Something Deeply Hidden) that the Many-Worlds interpretation of quantum mechanics might be the only way to avoid instantaneous effects of entanglement, by having the ...
- 41
4
votes
1
answer
1k
views
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
0
votes
2
answers
226
views
Is the spin in quantum entanglement set at the moment the particles are separated, instead of when measured? [closed]
Is the spin in quantum entanglement set the moment the particles are separated, instead of transmitted instantaneously to its twin particle at the time of measurement? Wouldn't this make more sense ...
- 13