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Morbert's latest activity
Morbert
replied to the thread
A
Resolution of the Frauchiger-Renner paradox
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An adjascent discussion is had here by Gell-Mann and Hartle: https://arxiv.org/pdf/gr-qc/9404013 (section IV), where hypothetical...
Wednesday, 3:35 AM
Morbert
replied to the thread
A
Resolution of the Frauchiger-Renner paradox
.
From the paper: Perhaps our only hope would be to evolve into exotic beings that register superpositions of macroscopically distinct...
Wednesday, 3:27 AM
Morbert
replied to the thread
A
Resolution of the Frauchiger-Renner paradox
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"in principle" might need to be qualified here as pertaining to a non-relativistic quantim mechanical universe, as physicists like...
Monday, 2:46 AM
Morbert
replied to the thread
A
Resolution of the Frauchiger-Renner paradox
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For posterity: https://www.physicsforums.com/threads/wigners-friend-and-incompatibility.976587/post-6227006
Sunday, 12:52 PM
Morbert
replied to the thread
I
Testing superposition of spacetime curvature
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https://physics.aps.org/articles/v10/s138 Some preliminary proposals for testing the quantum nature of gravity by seeing if it can be...
May 24, 2024
Morbert
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A. Neumaier's post
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A
What is decoherence?
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Like
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Yes. More precisely, collapse is the (not strictly permitted) reinterpretation of the reduced density matrix as an ensemble of pure...
Apr 25, 2024
Morbert
reacted to
lodbrok's post
in the thread
I
A new interpretation of Quantum Mechanics
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Like
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Filtering plays a huge part as already explained. Until the BSM results are used to condition the 14 analysis, no 14 entanglement can be...
Apr 12, 2024
Morbert
reacted to
cianfa72's post
in the thread
I
Qbit pure vs mixed state space
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Like
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Ok, therefore a density matrix representing a mixed state is not a projector. Basically a pure state is a dyadic tensor product of a...
Apr 8, 2024
Morbert
replied to the thread
I
Qbit pure vs mixed state space
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Yes, and as @gentzen mentioned: A projector that is of rank > 1 cannot by itself be a state, mixed or pure. If a state is a projector it...
Apr 8, 2024
Morbert
replied to the thread
I
Qbit pure vs mixed state space
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Yeah. I wasn't sure if the "i.e." was pertaining to "density operator" or to "projector"
Apr 8, 2024
Morbert
replied to the thread
I
Qbit pure vs mixed state space
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Yes, with the caveat about your "i.e." A projector does not have to be rank 1, and hence does not have to be associated with a vector in...
Apr 8, 2024
Morbert
replied to the thread
I
What is the statistical minimal interpretation?
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I find this review helpful https://www.kevinaylward.co.uk/qm/eis.pdf These are the broad patterns of the usage of words I have...
Apr 8, 2024
Morbert
replied to the thread
I
Qbit pure vs mixed state space
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From the message I linked Both pure and mixed states are density operators/matrices. A density operator that is a projector onto a...
Apr 8, 2024
Morbert
replied to the thread
I
Qbit pure vs mixed state space
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For posterity: An old thread post discussing some general subtleties that might eventually be relevant here...
Apr 8, 2024
Morbert
replied to the thread
I
Qbit pure vs mixed state space
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Mixed states have nonzero von Neumann entropy, and e.g. a pure state ##|\psi\rangle\langle\psi|## where ##|\psi\rangle =...
Apr 8, 2024
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