Physicists discover a hidden “curveball” in quantum light - Science Daily

Science News from research organizations Physicists discover a hidden “curveball” in quantum light Date: September 13, 2026 Source: Paul Scherrer Institute Summary: Researchers have experimentally demonstrated the optical Magnus effect for the first time, revealing that a tightly focused laser interacts most strongly with an atom slightly away from the beam’s center. The unexpected shift is similar to the physics that makes a spinning table tennis ball curve through the air. Because lasers are used to control qubits, the effect could create errors in quantum computers, but it might also provide a new way to couple qubits together. Share: Facebook Twitter Pinterest LinkedIN Email FULL STORY Putting spin on a ping-pong ball changes its trajectory – a similar effect also occurs in the quantum world. Credit: AI-generated symbolic image, Paul Scherrer Institute 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. A Laser's Strongest Interaction Is Slightly Off Center At first glance, it seems reasonable to expect that an ion would interact most strongly with a laser exactly at the beam's brightest point. But when laser light is focused very tightly, the structure of its electromagnetic field becomes more complicated. Because of that altered field structure, the strongest interaction does not occur exactly at the center of the beam. Instead, it appears slightly to one side. This small sideways displacement is the optical equivalent of the Magnus effect that makes a spinning table tennis ball curve through the air. That tiny shift could become important in quantum computing. Lasers are often used to change the states of qubits with very high precision. If the optical Magnus effect is ignored, it could interfere with that control and contribute to errors. The same effect may also be useful. "The forces it generates could be used to couple qubits to one another, enabling more complex computations," explains first author Philip Leindecker from the PSI Center for Photon Science and the Department of Physics at ETH Zurich. Using a Single Ion to Map Laser Light To detect the effect, the researchers used a single calcium ion as an extremely sensitive probe. The electrically charged atom was held nearly motionless in an ion trap, which uses electromagnetic fields to keep the ion fixed in place. Trapped ions are also widely used in quantum computing. They can function as qubits, with their quantum states manipulated using carefully controlled laser pulses. In the experiment, the team moved the calcium ion through different parts of a tightly focused laser beam and measured how strongly it interacted with the light at each position. "Our ion acts like a tiny sensor that we can use to feel out the structure of the laser light," Leindecker explains. "This makes it possible to measure a shift of just a few hundred nanometers." The measurements uncovered another surprising feature. The size of the sideways shift depends only on the wavelength of the light and not on how tightly the laser beam is focused. Researchers at the University of Amsterdam had predicted the optical Magnus effect theoretically several years ago. By using a trapped calcium ion as a microscopic probe, the team has now observed the effect experimentally for the first time and measured its behavior in greater detail. RELATED TOPICS Matter & Energy Spintronics Physics Chemistry Optics Computers & Math Spintronics Research Neural Interfaces Computers and Internet Hacking RELATED TERMS Quantum computer Introduction to quantum mechanics Quantum entanglement Physics Nanoparticle Electron configuration Quantum number Quantum tunnelling Story Source: Materials provided by Paul Scherrer Institute. Original written by Benjamin A. Senn. Note: Content may be edited for style and length. Journal Reference: Philip Leindecker, Louis P. H. Gallagher, Edgar Brucke, Dominique Zehnder, Luka Milanovic, Matteo Marinelli, Rene Gerritsma, Robert J. C. Spreeuw, Jonathan Home, Cornelius Hempel. Direct Observation of the Optical Magnus Effect with a Trapped Ion.

Physical Review Letters, 2026; 137 (6) DOI: 10.1103/kj5p-qqs5 Cite This Page: MLA APA Chicago Paul Scherrer Institute. "Physicists discover a hidden “curveball” in quantum light." ScienceDaily. ScienceDaily, 13 September 2026. .

Paul Scherrer Institute. (2026, September 13). Physicists discover a hidden “curveball” in quantum light. ScienceDaily. Retrieved September 13, 2026 from www.sciencedaily.com/releases/2026/09/260912220025.htm Paul Scherrer Institute. "Physicists discover a hidden “curveball” in quantum light." ScienceDaily. www.sciencedaily.com/releases/2026/09/260912220025.htm (accessed September 13, 2026). Explore More from ScienceDaily RELATED STORIES Caltech’s Massive 6,100-Qubit Array Brings the Quantum Future Closer Sep. 25, 2025 — Caltech scientists have built a record-breaking array of 6,100 neutral-atom qubits, a critical step toward powerful error-corrected quantum computers. The qubits maintained long-lasting superposition ... A New Model Accurately Predicts the Movement of Elite Athletes to Catch the Ball in Parabolic Flight Feb. 25, 2025 — How does a tennis player like Carlos Alcaraz decide where to run to return Novak Djokovic's ball by just looking at the ball's initial position? These behaviours, so common in elite ... Rethinking the Quantum Chip Dec. 10, 2024 — Researchers have realized a new design for a superconducting quantum processor, aiming at a potential architecture for the large-scale, durable devices the quantum revolution demands. Unlike the ... Cricket Physics: Science Behind the Modern Bowler Technique Tricking Batters Aug. 13, 2024 — Researchers have started to unravel the mysteries of how near-horizontal bowling in cricket leads to such tough-to-hit balls.

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