Quantum Mechanics and Relativity Tested in Free Fall Experiment
Physicists have successfully conducted an experiment to test the interaction between quantum mechanics and general relativity in free fall using a novel atom interferometer.
A team led by physicists at Ben-Gurion University of the Negev, including Nobel laureate Roger Penrose, has developed a new atom interferometer to investigate a long-standing theoretical question about the compatibility of quantum mechanics and Einstein's theory of gravity. The experiment measures how a single atom's wave properties are affected when it experiences free fall.
For nearly a century, physicists have theorized about the effects of free fall on quantum waves. A contradiction between quantum mechanics and relativity in this scenario would imply fundamental incompatibilities. Performing the necessary precise measurements has been a significant technological hurdle until now.
The newly developed interferometer allows a single atom to simultaneously traverse two paths: one in free fall and another where it remains stationary. By recombining these paths, researchers can measure subtle changes in the atom's wave phase, which is influenced by gravitational effects during its fall.
This experiment directly addresses how quantum wave behavior interacts with gravitational fields, a key area for understanding quantum gravity. The findings could provide crucial data for unifying these two pillars of modern physics.