/u/One_Significance2195's posts in /r/AskPhysics

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What examples of quantum mechanical states are there which can’t be represented by rays in a Hilbert space?

14 upvotes

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Is a unitary evolution the same as a reversible evolution?

9 upvotes

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What is meant by QED being the “self-consistent” version of a quantum theory of the photon?

6 upvotes

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Arguments for why the 1D Ising model doesn’t have a phase transition?

3 upvotes

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Why is it that heterodyne and homodyne detection don’t admit an interpretation as measuring an observable?

2 upvotes

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If thermal phase transitions are sourced by thermal fluctuations and quantum phase transitions by quantum fluctuations, are topological phase transitions sourced by topological fluctuations?

1 upvotes

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How can we distinguish between a 4 level system and a composite system of two qubits?

1 upvotes

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Why are there an infinite number of Interaction pictures?

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What is the fact that quantum information can’t be copied a justification for why measurements disturb a quantum system?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
What examples of quantum mechanical states are there which can’t be represented by rays in a Hilbert space?	14
Is a unitary evolution the same as a reversible evolution?	9
What is meant by QED being the “self-consistent” version of a quantum theory of the photon?	6
Arguments for why the 1D Ising model doesn’t have a phase transition?	3
Why is it that heterodyne and homodyne detection don’t admit an interpretation as measuring an observable?	2
If thermal phase transitions are sourced by thermal fluctuations and quantum phase transitions by quantum fluctuations, are topological phase transitions sourced by topological fluctuations?	1
How can we distinguish between a 4 level system and a composite system of two qubits?	1
Why are there an infinite number of Interaction pictures?	1
What is the fact that quantum information can’t be copied a justification for why measurements disturb a quantum system?	1