Timeline for Trouble understanding Sakurai's calculation of $\exp\left(\frac{iS_Z\phi}{\hbar}\right) \;S_x \; \exp\left(\frac{-iS_Z\phi}{\hbar}\right)$
Current License: CC BY-SA 4.0
15 events
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| Aug 3, 2019 at 12:28 | answer | added | ZeroTheHero | timeline score: 1 | |
| Jul 28, 2019 at 11:14 | comment | added | BioPhysicist | @DavidZ I certainly don't think that any question asking about a book's exposition deserves that tag. In this particular instance the question and method would seem like an exercise though. The key parts of it I tried to get the OP to think through in the comments. It's an exercise in working with "eigen-things", understanding what $e$ to the power of an operator is, etc. However, I'll always default to users with more experience, so if you change it I won't take it personally. | |
| Jul 28, 2019 at 10:01 | comment | added | David Z | @AaronStevens I see that you added the homework-and-exercises tag, but this seems to be just asking about a part of the book's exposition, not something that would make much sense as an assigned problem, and not something where the process matters but the answer doesn't. Personally, I wouldn't put that tag on this question. What do you think of taking it off? | |
| Jul 27, 2019 at 20:58 | answer | added | user21299 | timeline score: 1 | |
| Jul 27, 2019 at 13:14 | history | edited | Emilio Pisanty | CC BY-SA 4.0 |
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| Jul 27, 2019 at 13:12 | comment | added | Emilio Pisanty | @SnopD. If you've now understood the problem, I would encourage you to write up your solution as an answer for future visitors. | |
| Jul 27, 2019 at 0:00 | history | edited | BioPhysicist |
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| Jul 27, 2019 at 0:00 | review | Close votes | |||
| Jul 28, 2019 at 14:21 | |||||
| Jul 26, 2019 at 23:58 | comment | added | Snop D. | I see that now, thanks! | |
| Jul 26, 2019 at 23:56 | comment | added | BioPhysicist | Ok. Do you also understand that if $A|a\rangle=a|a\rangle$ then $e^A|a\rangle=e^a|a\rangle$? | |
| Jul 26, 2019 at 23:54 | comment | added | Snop D. | It would be $\hbar/2 |+ \rangle$ ? | |
| Jul 26, 2019 at 23:50 | comment | added | BioPhysicist | Well, what is $S_z|+\rangle$ equal to, for example? | |
| Jul 26, 2019 at 23:40 | review | First posts | |||
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| Jul 26, 2019 at 23:39 | history | edited | BioPhysicist | CC BY-SA 4.0 |
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| Jul 26, 2019 at 23:35 | history | asked | Snop D. | CC BY-SA 4.0 |