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Register a new userPoppers Experiment: A Modern Perspective
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Authors
Tabish Qureshi
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Karl Popper had proposed an experiment to test the standard interpretation of quantum mechanics. The proposal survived for many year in the midst of no clear consensus on what results it would yield. The experiment was realized by Kim and Shih in 1999, and the apparently surprising result led to lot of debate. We review Poppers proposal and its realization in the light of current era when entanglement has been well studied, both theoretically and experimentally. We show that the ghost-diffraction experiment, carried out in a different context, conclusively resolves the controversy surrounding Poppers experiment.
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In an effort to challenge the Copenhagen interpretation of quantum mechanics, Karl Popper proposed an experiment involving spatially separated entangled particles. In this experiment, one of the particles passes through a very narrow slit, and thereby its position becomes well-defined. This particle therefore diffracts into a large divergence angle; this effect can be understood as a consequence of the Heisenberg uncertainty principle. Popper further argued that its entangled partner would become comparably localized in position, and that, according to his understanding of the Copenhagen interpretation of quantum mechanics, the qo{mere knowledge} of the position of this particle would cause it also to diffract into a large divergence angle. Popper recognized that such behaviour could violate the principle of causality in that the slit could be removed and the partner particle would be expected to respond instantaneously. Popper thus concluded that it was most likely the case that in an actual experiment the partner photon would not undergo increased diffractive spreading and thus that the Copenhagen interpretation is incorrect. Here, we report and analyze the results of an implementation of Poppers proposal. We find that the partner beam does not undergo increased diffractive spreading. Our work resolves many of the open questions involving Poppers proposal, and it provides further insight into the nature of entanglement and its relation to the uncertainty principle of correlated particles.
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