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Results tagged with measurements
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user 373
For questions related to methods, analysis, accuracy, presentation, or interpretation of measurements. It is not intended for abstract quantum measurement questions such as how a wave function collapses during measurement or how the Heisenberg uncertainty principle constrains quantum measurements.
4
votes
Unambiguous distinguishing of quantum states by local measurement
(Edited to correct TeX typo)
I complete Tim Goodman's answer in answer to get something more systematic. A local measurement has to be written as a tensorial product of two observables A⊗B. And it ca …
- 11.1k
2
votes
Homodyne detection as quantum measurement
I think your confusion relies on a misunderstanding: a homodyne detection does not directly measures $\langle q \rangle$, but a value of the operator $\hat q$, by projecting the state on one of its e …
- 11.1k
17
votes
Accepted
If time standard clocks and any memories about the time standard are destroyed, can we recov...
It depends on your definition of "any memories". If you don't remember what a second is, there is no solution.
If you remember the "old" definition (a day has 24 h on 60 minutes, each of it is 60 s), …
- 11.1k
10
votes
Home experiments to derive the speed of light?
You might also want to try the rotating mirror method, of Léon Foucault. It is detailed here and here. The only difficult part is the rotating mirror, but it could probably be done with a drill.
- 11.1k
39
votes
Home experiments to derive the speed of light?
I don't know if it qualify as home experiment, but you can use the internet to get access to thousands of kilometres of optical fibres for free. It allows you to measure a lower bound for the speed of …
- 11.1k
2
votes
Accepted
Covariance matrix after projection on gaussian state
As suggested by @flippiefanus, it’s a case of completing the square. (Or, alternatively, it is a well known formula for Gaussian integration, but this sounds a bit like cheating)
If I’m not mistaken, …
- 11.1k
3
votes
Measuring the speed of light and defining the metre - absolute or relative?
I just complete @Chad Orzel's response by point : you seem to be worried on the effect of chosen frame of reference and space-time curvature. One of the reasons to redefine the meter in term of speed …
- 11.1k