Examining Einstein’s equivalence principle The atom chip used in the quantum Galileo interferometer experiment. In the experiment, the chip was upside-down and the atoms manipulated just below it. (Courtesy: Ben-Gurion University of the Negev)"> Examining Einstein’s equivalence principle The atom chip used in the quantum Galileo interferometer experiment. In the experiment, the chip was upside-down and the atoms manipulated just below it. (Courtesy: Ben-Gurion University of the Negev)

A new quantum test of the weak equivalence principle performed on the China Space Station using cold atom interferometry is the most precise to date, yielding an uncertainty of 2.8 x 10 -8 and a test result of around –2.7 x 10 -7 .…