Physicists finally put Feynman's path integral to the test
For nearly 80 years, physicists have relied on a thought experiment created by Richard Feynman to predict how quantum particles behave. For the first time, researchers in China have tested this trick directly in the lab.
Nearly 80 years after Richard Feynman proposed his thought experiment to predict quantum particle behavior, Chinese researchers have experimentally validated his path integral theory for the first time. Led by Shi-Liang Zhu at South China Normal University in Guangzhou, the team used single photons to demonstrate that Feynman's idea holds true in practical experiments.
Their findings, published in Science Advances, confirm that Feynman's predictions about probabilities arising from path interference and phases determined by classical action are accurate. By reconstructing probability amplitudes for over 1.4 million possible paths, the researchers were able to validate Feynman's theory with high precision, providing a crucial validation for decades of standard quantum calculations.
The team hopes this technique can be adapted to other physical systems to further test and expand the foundations of quantum theory.
Written by urgent.news from Phys.org's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
