Atreus57

While it should not be necessary, in the 21th century, to explain again why the measurement "problem" is not a problem at all, I am only too grateful some authors that finally wrote about this subject and explained the true "situation", namely that indeed, the "measurement problem" is a false problem. Here I can quote a very good review like http://arxiv.org/abs/1308.5290 While I could also quote some better textbooks, any student should know them. I invite the users to add other citations in the text and to complete the presentation I made with the details. I am not having much time now. However, I think my add is important in clarifying the stated issue and to explain why the historical "measurement problem" should be considered as solved in the context of quantum mechanics.

edit warring at measurement problem

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Thank you. --SineBot (talk) 10:42, 11 July 2014 (UTC)

Measurement problem

First of all, please excuse me if I make stupid spelling mistakes, I am typing this on my phone.

To continue the discussion started on the Measurement problem talk page, which has been closed for good reasons, since it was getting off topic: So you quote another, longer part from Schrödinger's paper. This one is actually even better to understand the measurement problem. It is stated clearly that the evolution in qm is twofold. You have the linear Schrödinger evolution and the nonlinear collapse evolution (you can call it whatever you want, if you dont like the notion collapse). The collapse reduces the wavefunction (again, you can call it expectation catalogue if you like) to one of the eigenstates of a linear operator. The measurement problem is: in which situations do you have to apply which type of evolution? QM has no unambiguous answer to this.

Now you say that "It is simply (really simply) that some questions are immaterial for the system considered in the context considered." Fine. That is just another way to put it. Then: which are the questions that are immaterial and which are not? What does it depend on? The theory does not tell you! This is the measurement problem. Xaggi (talk) 07:52, 12 July 2014 (UTC)