University of Oxford physicists have demonstrated quadsqueezing for the first time, using a single trapped ion to unlock complex quantum states 100 times faster than traditional methods.
In a milestone for quantum mechanics, researchers at the University of Oxford have successfully demonstrated a fourth-order quantum interaction known as quadsqueezing. The achievement, published May 1, 2026, in Nature Physics, marks the first time scientists have experimentally accessed these complex states, which were previously considered too weak to observe before being lost to environmental noise.
Quantum squeezing is a technique used to reshape the inherent uncertainty of a system. According to the laws of quantum physics, certain pairs of properties—such as position and momentum—cannot be known with perfect precision simultaneously. Squeezing allows scientists to make one property more certain by making the other more uncertain. This principle is already utilized in practical applications, most notably in the LIGO gravitational-wave detectors to improve sensitivity.
The Oxford team, led by Dr. Oana Băzăvan and supervised by Dr. Raghavendra Srinivas, moved beyond standard squeezing to achieve trisqueezing and quadsqueezing. To overcome the natural weakness of these higher-order effects, the team utilized a theory proposed by Srinivas and Robert Tyler Sutherland in 2021. By combining two carefully controlled forces on a single trapped ion, they created a hybrid interaction that is more than the sum of its parts, generating the quadsqueezing effect over 100 times faster than conventional methods.
This breakthrough is not merely a laboratory curiosity. By making these interactions accessible, the researchers have provided a new toolkit for quantum engineering. The method has already been used to generate superpositions of squeezed states and to simulate lattice gauge theories. Because the technique relies on components available across various quantum platforms, it offers a scalable path for decentralized innovation in sensing and computing.
As Silicon Valley continues to push for centralized quantum dominance, these findings from Oxford suggest that the future of the frontier may lie in the elegant manipulation of individual atoms. The ability to control such fundamental forces with high precision ensures that the next generation of sensors will be more accurate, potentially enhancing national security and scientific sovereignty through superior detection capabilities. The researchers are now looking to extend this method to more complex systems with multiple modes of motion.
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