All Questions
Tagged with quantum-interpretationsmeasurement-problem
137 questions
4votes
7answers
2kviews
How much can an observer know about its own quantum state?
Let me state my background: I am familiar with the usual formalism of QM, of how measurements are modeled, measurement problem, decoherence, etc. In thinking about the process of measurement, I was ...
- 85
4votes
4answers
443views
Solution to the measurement problem - explanation
Has the measurement problem been resolved? Could someone explain the current state-of-the-art understanding of why deterministic evolution results in a random measurement outcome? Is there a model ...
- 71
0votes
2answers
164views
Can the Many-Worlds Interpretation survive without assigning multiple copies of worlds for the same observation?
In Everett's original paper, he postulates a measure $\mu (x)$ to the branches of the universal wavefunction which correspond to measurement outcomes $x$, and argues that it should be given by the ...
- 6,847
-3votes
1answer
94views
What are some experimental facts/logical reasons to dismiss arguments for consciousness collapse interpretations? [closed]
Let's start by defining consciousness collapse interpretation as the claim that, when we a person performs a measurement of a quantum system, a definite outcome is realised only when the person ...
- 6,847
5votes
4answers
418views
Is there a resolution to the "Wigner's Friend" paradox?
Suppose that two observers $A$ and $B$ are mutually isolated, observer $A$ measures the state $|0\rangle + |1\rangle$ and concludes that the result is $|0\rangle$. However, observer $B$ concludes that ...
0votes
3answers
155views
What happens if two people have different knowledge about a state in a quantum mechanical system?
Let’s say I measure the spin of an electron, but I don’t tell you what it is and you don’t measure it yourself. Does that change the wave function for you or does it remain the same either way? If it ...
- 3
0votes
1answer
147views
Does a Quantum System Really "Jump" to an Eigenstate When Observed?
Warning: This is a highly hypothetical question. I am bothered with Dirac's description of the system when making a measurement. Without quoting his statement (from The Principles of Quantum Mechanics,...
- 31
6votes
4answers
969views
Exact time evolution of Stern-Gerlach (SG) apparatus
Background: I was always under the impression that when considering the Stern-Gerlach (SG) Experiment, the interpretation of the split of the beams is that the spin $1/2$ particle get measured the ...
- 671
4votes
1answer
161views
Understanding Wigner’s friend scenario
I recently watched this video https://youtu.be/Wsjgtp9XZxo?si=sIRlAbvAm2wjXRNP and tried (unsuccessfully, because i don’t have the knowledge required) to read Bruckner’s paper. What i am missing, is ...
1vote
2answers
251views
How can the Copenhagen and Everett interpretations of quantum mechanics make the same predictions?
Suppose we have a spin $\frac{1}{2}$ particle in the spin-up state along the $z$-axis, $\lvert \uparrow \rangle$, and after $t$ seconds of evolution under the Schrodinger equation it is in state $\...
- 103
0votes
0answers
54views
Measurement Problem Explained by Interaction of Operator With Adjoint Having Larger Domain?
Quantum physics axiomatically uses a self-adjoint operator for a measurement. In general, the adjoint of an operator has a larger domain than an operator. Could it be that the "measurement ...
2votes
3answers
308views
Is the measurement problem an interpretation or practical problem?
According to Wikipedia: In quantum mechanics, the measurement problem is the problem of how, or whether, wave function collapse occurs. Is the measurement problem an interpretation problem or a ...
- 1,609
0votes
4answers
324views
Is the many-worlds interpretation less ill-defined than the Copenhagen interpretation? [closed]
In my understanding, the Copenhagen interpretation is ill-defined in the following way. The interpretation says that wavefunctions collapse when a measurement is performed. But the Copenhagen ...
- 1,609
3votes
3answers
935views
Can gravity cause a wave function to collapse?
Assume the Copenhagen interpretation. Suppose that a particle, for example an electron, has a wavefunction. If a heavy object, like the Earth, is close by, then that object interacts with the electron ...
- 1,609
1vote
5answers
668views
Testability of consciousness-causes-collapse interpretation
The consciousness causes collapse a.k.a. Von Neumann–Wigner interpretation says that the wavefunction collapse occur only at the point when a conscious being observes the result. I myself find it ...
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