Timeline for Does measuring an observable $\hat{\theta}$ for a QM system in a state $|\psi\rangle$ preserve the expansion coefficients of $|\psi\rangle$?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 28, 2021 at 12:06 | vote | accept | test123 | ||
| Jun 28, 2021 at 11:52 | answer | added | J. Murray | timeline score: 2 | |
| Jun 28, 2021 at 11:26 | comment | added | Andrea | @test123 if you want you can keep it, then the normalisation constant will be $\lambda=\sqrt{6/5}$ | |
| Jun 28, 2021 at 11:24 | comment | added | test123 | @MariusLadegårdMeyer Thanks for the comment/answer but since projection is linear, shouldn't the $1/\sqrt{6}$ be preserved as well? | |
| Jun 28, 2021 at 11:21 | comment | added | garyp | This sounds like an answer. | |
| Jun 28, 2021 at 11:09 | comment | added | Marius Ladegård Meyer | The measurement can be mathematically enforced by a projection operator onto the space with eigenvalue $m=0$. Your first two kets are already in this subspace, so they don't change when projected, and since your states are orthogonal, the last ket vanishes upon projection. This projection agrees with the Born rule. | |
| Jun 28, 2021 at 11:06 | history | edited | test123 | CC BY-SA 4.0 |
edited title
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| Jun 28, 2021 at 11:00 | history | asked | test123 | CC BY-SA 4.0 |