Researchers observe gravity's predicted quantum phase
Researchers have experimentally confirmed that gravity affects quantum objects in accordance with Einstein's equivalence principle. By using a quantum interferometer to split an atom's path, the team observed that gravity influences quantum waves just as it does classical objects.
Why it matters
This experiment provides crucial empirical evidence for how gravity interacts with the quantum world, helping physicists bridge the gap between general relativity and quantum mechanics.
JERUSALEM – An international team of researchers has observed a long-predicted effect of gravity on a falling quantum object, showing a key principle behind Einstein's theory of gravity remains valid even in the quantum world, Israel's Ben-Gurion University of the Negev said in a statement on Thursday.
Einstein's equivalence principle is the idea that gravity affects all objects equally, regardless of mass. According to this principle, a freely falling observer should locally experience no gravitational force. However, quantum objects can behave as waves and effectively travel along more than one path, raising the question of whether the principle remains valid when "the object" does not follow a single definite classical path.
In the new study published in the journal Science Advances, the researchers tested the principle on microscopic objects governed by quantum mechanics and found that gravity behaved exactly as Einstein predicted.
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