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Physicists finally put Feynman's path integral to the test
Phys.org • • general
Key Points:
- For the first time, researchers led by Shi-Liang Zhu at South China Normal University have experimentally tested Richard Feynman's 1948 quantum "path integral" thought experiment using single photons.
- Their experiment measured the probability amplitudes of over 1.4 million possible photon paths, confirming that each path contributes equally in strength but differs in phase, as Feynman predicted.
- The team overcame significant technical challenges to achieve high-precision measurements, validating key assumptions in quantum mechanics that had remained unconfirmed for nearly 80 years.
- Published in Science Advances, the results reinforce the foundational quantum theory and open possibilities for applying this method to study photon behavior in different physical environments.
