Timeline for A novice question on Quantum Mechanics
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Aug 8, 2013 at 2:10 | comment | added | Andreas Blass | A convex combination of two different density matrices produces a classical mixture, not a quantum superposition, even if the two matrices you began with represent pure states. | |
| S Aug 8, 2013 at 0:08 | history | suggested | Michael Albanese | CC BY-SA 3.0 |
Replaced \\! with \!
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| Aug 7, 2013 at 23:50 | review | Suggested edits | |||
| S Aug 8, 2013 at 0:08 | |||||
| Dec 24, 2012 at 14:52 | history | edited | Federico Poloni | CC BY-SA 3.0 |
fixed two mistakes pointed out in the comments
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| Dec 24, 2012 at 11:42 | comment | added | Federico Poloni | Well, I could as well delete this answer now, Konrad has written these concepts up in a much better way | |
| Dec 24, 2012 at 11:36 | comment | added | Federico Poloni | Both your observations are correct, I was sloppy above. One needs indeed to consider positive semidefinite trace-1 matrices, which are the convex hull of their rank-1 subset. | |
| Dec 24, 2012 at 11:23 | comment | added | Michael Murray | You can't add trace one matrices and get a trace one matrix though. I guess you are adding and renormalising ? Forming a convex combination as Konrad points out. | |
| Dec 24, 2012 at 10:55 | comment | added | Branimir Ćaćić | Not just any matrices, though, but the positive (semi-definite) ones. | |
| Dec 24, 2012 at 9:21 | history | answered | Federico Poloni | CC BY-SA 3.0 |