All Questions
Tagged with quantum-entanglement wavefunction-collapse
43
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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 ...
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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 ...
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Wave function collapse for experimental quantum state preparation
Has the John von Neumann projection, or the wave function collapse, been used in the experimental preparation of quantum states? As an illustration, for a pair of EPR-type entangled 2-level atoms
$$|\...
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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 ...
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Can we tell if a particle has collapsed due to a measurement?
Suppose we have two electrons A and B.
My friend measure the spin on electron B the value is +1/2, and he writes on a piece of a paper the value.
Electron A has not been measured, so the spin is in ...
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If I have a two-electron problem, and I measure the position of one electron. What happens to the quantum description of the other?
Suppose I have a two-electron system, and they are left alone for a long time, such that I do not know where each of them is. I then measure one electron at position $\vec r_1$. Does this collapse the ...
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Does Quantum Entanglement have a preferred reference frame?
What I mean by this is, with wave function collapse,--and by extension, collapse between two entangled particles--being nonlocal (instantaneous across space), in what reference frame does the ...
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When does quantum entanglement cease?
On Wikipedia on Quantum entanglement:
“However, this behavior gives rise to seemingly paradoxical effects:
any measurement of a property of a particle performs an irreversible collapse on that ...
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Instantaneous quantum features
Two of the most striking quantum oddities are entanglement and the wave-function collapse or state vector reduction.
Firstly, quantum entanglement is the quantum phenomena involving states of ...
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Doesn't the Schrödinger's cat inside the box cause the probability wave function to collapse long before a human opens the box?
My point is that there is no superposition of dead and alive. The cat will cause the probability function to collapse long before we open the box. What am I missing here? Isn't the cat capable of ...
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Does Quantum Entanglement happen between two wavefunctions? [closed]
Does the entanglement happen between two particles or two wavefunctions? If it's wavefunction then what happens to the two wavefuntions after getting entangled?
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Annihilation Operator on Entangled State - How Does This Not Break No-Communication Theorem?
If I have the state
$$|\psi\rangle=\frac{1}{\sqrt{2}}\left(|2\rangle_{A}|0\rangle_{B}+|0\rangle_{A}|2\rangle_{B}\right)$$
and apply the annihilation operator to B
$$a_{B}|\psi\rangle=|\phi\rangle=\...
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Does entangled states must become non entangled states after the measurement?
In tensor notation. A state vector $|uv\rangle$ is a tensor product(non entangled states) if and only if there is $A\in E_1(u)$ and $B\in E_2(v)$ such that $A\otimes B$.
So by postulate of quantum ...
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Wave function collapse, EPR paradox and information transfer
For a classical formulation of the EPR paradox, two particles are produced, with total momentum zero and separated by a long distance. So say we measure the momentum of one particle first, and measure ...
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When light reflects off a mirror, does the wave function collapse?
This question is specific to the Copenhagen interpretation, which states that the wave function collapses on interaction. If we have a beam of light reflected off a mirror, whether you see this light ...
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