Talk:Stern–Gerlach experiment
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[edit] external link
There is a nice explanation in this page: http://rugth30.phys.rug.nl/quantummechanics/stern.htm
but I do not have time to summarize/rewrite.
-- ato 21:35, 1 Sep 2004 (UTC)
[edit] Description Rewritten
Hey what do you think about the rewritten basic theory/description section? BeardedPhysicist 23:58, 14 May 2006 (UTC)
- pretty well written overall. nice. Mct mht 06:18, 17 June 2006 (UTC)
[edit] History?
Strange that there are no links to articles about Stern or Gerlach or even anything that says when this experiment was done! Michael Hardy 18:19, 9 Sep 2004 (UTC)
OK, now I've added some of that information. Various web pages say it was done in 1920, and others say 1922. Could it be that 1920 was the date of execution and 1922 was the date of publication? Just a guess. Michael Hardy 18:31, 9 Sep 2004 (UTC)
- I have added a section "Impact" where we can discuss all the related stuff that came AFTER that experiment. this will be usefull to include the links to more modern experiments or physics.
Alain Michaud 01:32, 23 December 2005 (UTC)
[edit] Original text was copied from external page
The original edit, as of 6 September 2004, seems to have been copied from [1]. I've left a note on the user's user page; I'm going to rewrite the article. -- Creidieki 02:44, 12 Sep 2004 (UTC)
[edit] Details
...is blank. Brianjd
[edit] Please excuse me while I dump these here for now
[edit] Question related to entaglement and this experiment
Imagine that you have this Stern-Gerlach apparatus but also another one on the rigt side (mirrored). Now if we send two entagled particles, one on the left and one on the right they will still be defleted up or down for some discrete value. Right? Now imagine that we changed spin of one particle (on the left side) while it was going through inhomogeneous magnetic field. That change will be transfered to the right particle instanteniously. That means that at the end particle will not be defleted at the some of previous 2 descrete values because we changed the spin while it was going through magnetic field. In that way if we want to transfer classical information from the left side to the right we can change states of the particles going through magnetic field on the left and on the right side we will se that particles are not deflected in some of 2 descrete values. In that way we can transfer classical information (change of the states of the left particles) to the right side faster than light. Can anyone explain what is wrong with this?
P.S. Feel free to change my question to meet standards of wikipedia. This is my first entry so I don't really now the rules. Thank you.
many details in the question posed are not necessary, e.g. one doesn't really need the G-S experiment and the question can be phrased in more general and simpler terms. following is the reply.
what's stated is wrong because the way you are proposing to send classical information is impossible. so one party, say A, locally manipulates the system, and through entanglement, causes state change in B. to send classical information means precisely that B performs a measurement, and, if this is going to work, must be able to recover the classical information according to measurement outcome. one can show that no matter how A interacts with the system locally, the measurement statistics on B's subsystem remains the same. this is exactly the statement of no communication theorem. similarly, quantum information can not be transmitted faster than light either. see also quantum teleportation. Mct mht 05:45, 17 June 2006 (UTC)
[edit] Spin numbers
For greater clarity I think the quantum number S and ms should be differentiated between. i.e. that electrons are fermions, and therefore posses a spin number of +1/2, which is a property intrinsic to the electron, and that the electron itself can be 'orientated' to give a projection spin quantity of +/- 1/2, which is a property of a situation or specific electron in an atom. In the experiment, all electrons, by their nature, have a spin number of 1/2, but have angular momentum projection number of +/- half when detected in a system, hence there being two possible (degenerate) quantum states for ground state silver- and the two lines.
Sorry if this doesn't make any sense! This article was recently slated by a university professor, but I feel it's content isn't wrong, just in-explicit.
Alexanderhowell 15:06, 6 March 2007 (UTC)
