Oxford scientists create rare quantum effect 100 times faster than expected It demonstrated quad squeezing at a pace that has left the scientific community reeling, achieving the effect 100 times faster than anyone thought possible. For the first time in quantum physics, Oxford researchers have demonstrated quadsqueezing, a complex fourth-order quantum interaction. The study introduces a novel method for controlling quantum harmonic oscillators — systems that mimic vibrating objects such as springs or pendulums at the subatomic level. It demonstrated quad squeezing at a pace that has left the scientific community reeling, achieving the effect 100 times faster than anyone thought possible. “The result is more than the creation of a new quantum state. It is a demonstration of a new method for engineering interactions that were previously out of reach,” said Dr. Oana Băzăvan, lead author from the Department of Physics, University of Oxford. “The fourth-order quadsqueezing interaction was generated more than 100 times faster than expected using conventional approaches. This makes effects that were previously out of reach accessible in practice,” Băzăvan added. The experiment setup Physicists have long used a trick called “squeezing” to sharpen the fuzzy measurements of the subatomic world. It is why gravitational-wave detectors, like LIGO, can hear black holes colliding across the universe. But for all its utility, ordinary squeezing is a relatively simple, second-order effect. Going higher — into the complex realms of trisqueezing and quadsqueezing — has long been dismissed as an experimental pipe dream. Until today. In a recent paper, a team led by Băzăvan and Dr. Raghavendra Srinivas announced the identification of out-of-reach quantum interactions using a single trapped ion. Two carefully controlled, simpler forces were applied to a trapped ion using a phenomenon called non-commutativity. In particular, researchers experimentally demonstrated quadsqueezing, a complex fourth-order quantum interaction previously considered