Physicists discover a hidden “curveball” in quantum light

Physicists have experimentally confirmed the optical Magnus effect, a quantum phenomenon where laser light interacts most strongly with an ion slightly off-center rather than at the beam's brightest point. Using a single calcium ion as a microscopic sensor at the Paul Scherrer Institute, researchers measured this tiny sideways shift of a few hundred nanometers. The discovery could affect quantum computing precision and potentially help link qubits together for more complex calculations.