Physicists discover a hidden “curveball” in quantum light
Physicists at the Paul Scherrer Institute have observed the 'optical Magnus effect' at the atomic scale, where laser light interacts with an ion slightly off-center. This discovery explains how electromagnetic field structures can cause unexpected shifts in light-matter interaction, which could impact the precision of quantum computing.
Why it matters
Accounting for this effect is essential for improving the accuracy of quantum computers, as it could either be a source of error or a tool for better qubit control.
Table tennis players can make a ball suddenly curve by giving it just the right spin. That motion is caused by the Magnus effect, a familiar piece of physics that also influences the flight of larger balls in sports such as soccer.
Now, an international team working at the Paul Scherrer Institute PSI has observed a related effect at the atomic scale. For the first time, researchers have experimentally demonstrated the optical Magnus effect by focusing laser light on a single ion and measuring how the light interacts with it.
Instead of causing an atom to follow a curved path, the effect shifts the location where the laser interacts most strongly with the ion. That interaction point moves slightly sideways, a finding that could matter for quantum computers that use laser light to control qubits with extreme precision. The results were published in Physical Review Letters .
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