In 1950, Chien-Shiung Wu and her student published a coincidence experiment
on entangled photon pairs that were created in electron-positron annihilation.
This experiment precisely verified the prediction of quantum electrodynamics.
Additionally, it was also the first instance of a precisely controlled quantum
entangled state of spatially separated particles, although Wu did not know
about this at the time. In 1956, Wu initiated and led the so-called Wu
experiment, which discovered parity nonconservation, becoming one of the
greatest experiments of the 20th century. As Chen Ning Yang said, Wu’s
experiments were well known for their precision and accuracy. Experimental
precision and accuracy manifested Wu’s scientific spirit, which we investigate
here in some detail. This paper is the translated transcript of the speech the
author made at the International Symposium Commemorating the 110th Anniversary
of the Birth of Chien-Shiung Wu, on May 31, 2022. The above abstract is the
translation of the original abstract of the speech.

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