Experimental Realization of Popper's Experiment: Violation of the Uncertainty Principle?
- Cite this article as:
- Kim, YH. & Shih, Y. Foundations of Physics (1999) 29: 1849. doi:10.1023/A:1018890316979
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An entangled pair of photons (1 and 2) are emitted in opposite directions. A narrow slit is placed in the path of photon 1 to provide the precise knowledge of its position on the y-axis and this also determines the precise y-position of its twin, photon 2, due to quantum entanglement. Is photon 2 going to experience a greater uncertainty in momentum, that is, a greater Δpy because of the precise knowledge of its position y? The experimental data show Δy Δ py < h for photon 2. Can this recent realization of the thought experiment of Karl Popper signal a violation of the uncertainty principle?