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seen May 14 '13 at 23:05

May
7
comment Positivity in the Pauli/Bloch/coherence vector representation
Is your question about whether there is a nice constraint on $\vec{x}$ such that $\rho$ is positive, in the $n$-qubit setting just like in the 1-qubit case? Of course, I don't know of such a constraint and would be very interested to find out.
Jan
30
awarded  Editor
Jan
30
revised Is it part of special relativity that mass possessing energy is more dense?
added 9 characters in body
Jan
30
answered Is it part of special relativity that mass possessing energy is more dense?
Mar
3
comment Conservation of energy in quantum teleportation
@Peter @Lubos Just wanted a clarification as this would completely answer my question: So, if we have a bipartite Hilbert space, then will the Hamiltonian of the system always be of the form $H_A \otimes H_B$? I suppose the reason for this is that in quantum mechanics the Hilbert space of a quantum system is generated from the eigenvectors of the Hamiltonian (via the Schrodinger equation) and so the Hamiltonians being in the tensor product form is equivalent to the postulate that a combined system has the tensor product structure.
Mar
3
comment Eigenvalue Postulate and Experiment Outcomes in QM
That I understand. This was the reason I wrote the line: "eigenvalues can serve the same purpose as the indices". But the eigenvalues carry more information than just an index. That's why I mention the scale information too. So I understand that there is no motivation for quantum information theorists to look at the actual physical value of the outcomes as Lubos pointed out. But as far as quantum mechanics goes, the way the postulate is stated is not complete. That's all I wanted to clarify.
Mar
2
comment Eigenvalue Postulate and Experiment Outcomes in QM
So am I right in saying that this is a weaker statement of the general quantum measurement postulate, since it leaves out the part about eigenvalues(which I understand is irrelevant for their purposes)?
Mar
2
comment Eigenvalue Postulate and Experiment Outcomes in QM
@MBN, Please see the lines: "While the eigenvalues can serve the same purpose as the indices, they contain more information than just an index: don't they also carry scale information?...." in my question.
Mar
2
asked Eigenvalue Postulate and Experiment Outcomes in QM
Feb
27
awarded  Supporter
Feb
26
awarded  Teacher
Feb
26
answered Free falling of object with no air resistance
Feb
26
comment Conservation of energy in quantum teleportation
@Peter Shor, Thanks. It seems to be pretty straightforward.
Feb
26
awarded  Student
Feb
26
asked Conservation of energy in quantum teleportation