All Questions
34
questions
2
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0
answers
50
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Is it possible that a macroscopic object tends to a separable state without the need for objective collapse?
For a multi-particle system, superposition is in some sense equivalent to entanglement; with the Dirac field being treated as classical under second quantization, for example, we could at least argue ...
- 2,475
3
votes
3
answers
221
views
Was Einstein "spooky action at a distance" about entanglement or about wave function collapse?
I've been watching Sabine's videos and this is my understanding:
There is no "spooky action at a distance" based simply on entanglement. Entanglement is a correlation. There is no ...
- 39
0
votes
4
answers
331
views
Is signal photon independent of idler photon in Delayed Choice Quantum Eraser?
--Diagram from Wikipedia of the experiment of Kim et al. (1999)
Original research paper: A Delayed Choice Quantum Eraser
I want to know whether the landing position of the signal photon (photon that ...
- 613
19
votes
1
answer
7k
views
Is my interpretation of the underlying idea behind this 2022 Nobel Prize story “How physicists proved the universe isn’t real” more or less accurate?
I’m not very good at math but I frequently watch PBS Spacetime on YouTube to try to satisfy my curiosity about physics despite that.
In a recent video by Dr Ben Miles titled “How Physicists Proved the ...
- 1,821
0
votes
1
answer
119
views
Postulate of wave function collapse and entanglement
Can we say that a measurement on a system of $k$ entangled particles is the cause of the collapse of the wave function into $k$th states simultaneously?
- 1,400
0
votes
1
answer
73
views
Quantum entanglement
Suppose we have two particles with entangled eigenfunctions. Let's say they are in two different regions of space, with different local Hamiltonians. Now we measure one of them, therefore the other. ...
1
vote
0
answers
45
views
Quantum entanglement information through time of collapse
(I've tried my best to find an existing question that asks this question exactly)
From what I understand, given two entangled particles, one held by Alice and one by Bob, when a measurement is done by ...
- 111
2
votes
0
answers
115
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Have objective collapse theories been ruled out by recent experiments?
Have objective collapse theories been ruled out by recent experiments, such as the entanglement of macroscopic objects? (vibrating drumheads)
- 31
1
vote
1
answer
207
views
Will the Hilbert space get expanded when measuring the entangled state?
If I have two electrons that are indistinguishable, as I understand, they are entangled. And the Hilbert space that describes the behavior of this pair of electrons is a subspace of the Tensor product ...
- 47
0
votes
1
answer
111
views
Detecting collapse using single slit
A collapsed state should act like a particle and a non-collapsed like a wave. Is this statement true? So if you had a single slit and detectors behind it off to the sides... The collapsed state should ...
- 111
6
votes
3
answers
335
views
Are combined fermion wavefunctions still antisymmetric after wavefunction collapse?
If we have two electrons in a state $|\psi\rangle=\frac{1}{\sqrt2}[|\uparrow\downarrow\rangle+|\downarrow\uparrow\rangle]$ and we measure the spin of the first electron to be up, does the wavefunction ...
- 2,604
0
votes
0
answers
17
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Identifying Collapse in Wave-function [duplicate]
Is there a machine or instrument which will notify us instantly when the wave-function has collapsed if we have access to only one of the entangled particles? Note that the wave function collapse will ...
- 111
0
votes
3
answers
408
views
Is there a way to detect the collapse in wave function of entangled particles instantaneously? [closed]
Is there a machine or instrument which will notify us instantly when the wave-function has collapsed if we have access to only one of the entangled particles? Note that the wave function collapse will ...
- 111
-2
votes
6
answers
461
views
Problem regarding quantum entanglement and special relativity
So this question is about the strange phenomenon of quantum entanglement, or "spooky action at a distance", as Einstein called it. In particular, it's about the simplest conceivable case of ...
- 863
1
vote
1
answer
67
views
Is there anyway to know when the wave function collapse?
If we get 2 entangled particles and move them away from each other, is there a way to put one of them is some kind of "sensor" that would tell if the entangled particle have been measured?
If yes, how ...
- 141