That is, the outcomes measurements made in distant locations can be correlated with each other in ways that would be impossible if the measurements were truly independent and information about the results could only pass from one to the other at speeds slower than the speed of light. One of the most philosophically disturbing ideas to come from quantum physics is the fact that the theory is non-local. So, really, this one experiment contains everything you need to show conclusively that the wave nature of matter is a real phenomenon. If you want all the gory details, here's the Nature Nanotechnology paper, and the free version on the arxiv.) (If you want more detail, I did a detailed write-up of this experiment back in 2012. Slower speeds mean lower momentum, though, which means a longer wavelength, and thus a larger spacing between the stripes. You can even spot the relationship between momentum and wavelength in the angle of the stripes- the spacing is wider toward the bottom of the figure because those molecules are moving slower, and took more time to cover the distance between the grating and the detector. The compilation of all the detections, though, reveals a pattern of bright and dark stripes that is the result of interference. ![]() Each dot in the figure represents a single molecule, and their arrival times and locations are essentially random. They passed a beam of phthalocyanine molecules through a nanofabricated diffraction grating, and used fluorescence light to detect single molecules striking a glass plate on the far side.
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