Researchers at the University of Oxford have successfully demonstrated quadsqueezing, a fourth-order quantum effect that allows for unprecedented control over atomic motion and could revolutionize high-precision sensors.
In a significant leap for quantum mechanics, a research team at the University of Oxford has successfully demonstrated a fourth-order quantum effect known as quadsqueezing. The achievement, published in Nature Physics, marks the first time scientists have been able to manipulate these elusive interactions, which were previously considered too weak and noise-sensitive for practical use.
Led by Dr. Oana Băzăvan of Oxford’s Department of Physics, the team utilized a single trapped strontium ion to break through the barriers of quantum uncertainty. In the quantum world, certain pairs of properties—such as position and momentum—cannot be measured simultaneously with perfect precision. Squeezing is a technique that redistributes this uncertainty, making one property more precise at the expense of the other. While standard squeezing is already utilized in facilities like the LIGO gravitational-wave observatory to detect ripples in spacetime, higher-order effects like trisqueezing and quadsqueezing have remained largely theoretical until now.
The breakthrough relies on a 2021 theoretical framework proposed by Dr. Raghavendra Srinivas and Robert Tyler Sutherland. By combining two simple forces that do not “commute”—meaning the order in which they are applied changes the outcome—the researchers forced the forces to amplify one another. This non-commutative approach allowed the team to generate quadsqueezing interactions more than 100 times faster than conventional methods would allow.
Dr. Băzăvan noted that while non-commuting interactions are typically viewed as a nuisance in the laboratory due to the unwanted dynamics they introduce, her team leveraged these features to engineer interactions that were previously out of reach. By adjusting the frequencies and phases of the applied forces, the researchers could toggle between different levels of squeezing, effectively creating a new toolkit for quantum engineering. This control is essential for modern quantum technologies, ranging from extremely precise measurement tools to the development of next-generation quantum computers.
To confirm the discovery, the team reconstructed the quantum motion of the trapped ion, revealing distinct patterns that verified the presence of second-, third-, and fourth-order squeezing. These results suggest that the method could be applied to more complex systems, including those with multiple modes of motion. The approach has already been combined with mid-circuit measurements of the ion’s spin to generate flexible combinations of squeezed states and to simulate a lattice gauge theory.
This development holds profound implications for national sovereignty and technological independence. As the global race for quantum supremacy intensifies, the ability to engineer faster, more stable quantum interactions provides a clear path toward decentralized innovation in secure communications and advanced sensing. By mastering these fundamental physical laws, researchers are moving closer to a future where quantum technology serves as a robust pillar of precision and security, free from the constraints of current computational limits. Dr. Raghavendra Srinivas, who supervised the work, expressed excitement for the discoveries to come as this breakthrough allows physicists to explore uncharted territory in quantum physics.
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