Dear Uwe Jänen,

Not only about electrons, but also regarding atoms, molecules etc, see the following important references and also references therein.

[1] C. Josson, Am. J. Phys. 42, 4 (1974).

[2] A. Zeilinger, R. Gahler, C.G. Shull, W. Treimer and W. Mampe, Rev. Mod. Phys. 60, 1067 (1988).

[3] O. Carnel and J. Mlynek, Phys. Rev. Lett. 66, 2689 (1991).

[4] W. Schollkopf and J.P. Toennies, Science 266, 1345 (1994).

[5] O. Nairz, M. Arndt, and A. Zeilinger, Am. J. Phys 71, 319 (2003).

Thanking you and best regards....NG.

Thank you both for your effort and answers. I'm just an interested layman and do not have a deep understanding of quantum physics.

In special I am interested in the interaction of the measuring installation and the quantum object before hitting the screen showing the two lines respectivaly the interference pattern. As I understand, this interaction seems to provoke the behavior as particle. So to me it is intresting what happend with the quantum object e.g. electron.

The most crazy behaviour to me is, that it makes no difference whether the observing of the quantum object is done before or after passing the double-slit.

Are there theories that consider the quantum object as a multidimensional (> 3) particle? So that the behavior of the particle changes, but it only shows another part of it to the observing system. From the two-dimensional point of view, a pencil touching a paper sheet seems to be a point. But when some kicks the pencil and it falls, the pencil becomes a line from the two-dimensional point of view.

From my view as computer guy, it seems as someone is saving computing power like in a video game. The environment far away is only shown blurry. Only if you go near to an object it shows its details. Laziness also exists in the quantum world :-D

Hi Uwe,

I’ll answer your question after the next paragraph, which I hope will interest you.

I also am an amateur in QM but very interested in the subject. A very well-done, very easy to understand, and uncompromisingly accurate course in QM is available as a MOOC at edX.org. It is called Quantum Mechanics for Everyone and is free. It is remarkable how the course, with a minimum of math, can start with the basics and go on teach you to understand graduate-level QM. The Stern-Gerlach experiment, the two-slit experiment, quantum seeing-in-the-dark and several other experiments and landmark results are covered. Further, there are many interactive simulations you can play with and experiment with. I found the course to be a remarkable learning experience.

Now to address your question:

The article “Feynman’s double-slit experiment gets a makeover” in Physics World at

https://physicsworld.com/a/feynmans-double-slit-experiment-gets-a-makeover/

gives a summary of an actual two-slit experiment performed with electrons.

That article contains a link to this paper in the New Journal of Physics: “Controlled double-slit electron diffraction”

http://iopscience.iop.org/article/10.1088/1367-2630/15/3/033018/meta#nj458349fig1

In that paper there is a link to a detailed description of the experimental apparatus:

http://iopscience.iop.org/1367-2630/15/3/033018/media/njp458349suppdata.pdf

All the articles are available for free on the internet. No payment, subscription, or registration is required. Also, they are available as web pages or as PDF files. (The last link seems to be available only as a PDF file.)

Best of luck. Enjoy the adventure of discovery.

Regards, Bill

Hi Bill,

thank you for the articles and the hint on the MOOC at edX.org. They are verry helpfull!

Best regards, Uwe

Additional info for other laymen/ amateurs:

I found a book which explains the basics of quantum theorie and also enlights its origin and different opinions of the researchers (Einstein etc.). The main clue on it: it is a comic book. Unfortunately it is only available in the german language (https://www.tibiapress.de/shop/quantentheorie-ein-sachcomic/).

One should not be misled by the form as a comic. Nevertheless, it requires a lot of basic physical knowledge.