![]() ![]() The double-slit experiment (and its variations) has become a classic for its clarity in expressing the central puzzles of quantum mechanics. The results, then, differ depending on whether you’re looking and measuring. ![]() But if you put a detector at each slit, observing which one each photon goes through, you now get a mirror of the two-slit pattern on the screen: the photons go through one slit and not both. For example, if you let photons from a single source go through two slits in a plate, and don’t observe which slit they go through, they form an interference pattern on a screen on the other side, implying that light is a wave, and is going through both slits at once. In the video below, physicist Sabine Hossenfelder deals with the deeply weird nature of quantum mechanics-in this case, can human consciousness cause collapse of the wave function? This is connected with famous experiments like the “ double slit experiment” or the Gedankenexperiment of Schrödinger’s cat-scenarios where the apparent outcome of a study depends on whether someone is looking at it and measuring the outcomes. ![]()
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