Experimental Realization of Popper's Experiment: Violation of the Uncertainty Principle?

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https://link.springer.com/article/10.1023/A:1018890316979

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https://doi.org/10.1023/A:1018890316979
 http://hdl.handle.net/11603/39886

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UMBC Faculty Collection
UMBC Physics Department
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1999-12-01

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journal articles
preprints
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Citation of Original Publication

Kim, Yoon-Ho, and Yanhua Shih. "Experimental Realization of Popper’s Experiment: Violation of the Uncertainty Principle?" Foundations of Physics 29, no. 12 (1999): 1849–61. https://doi.org/10.1023/A:1018890316979.

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Subjects

Opposite Direction
Experimental Realization
Uncertainty Principle
Thought Experiment
UMBC Quantum Optics Laboratory
Experimental Data

Abstract

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 Δp* because of the precise knowledge of its position y? The experimental data show Δy Δ p* < h for photon 2. Can this recent realization of the thought experiment of Karl Popper signal a violation of the uncertainty principle? *= subscript y