Scientists have demonstrated quadsqueezing, a fourth-order effect, using a trapped-ion setup, making hidden quantum effects visible and impactful for advanced technologies.
Experimental trapped-ion setup used to generate the family of squeezed states. The ion is confined between electrode structures and controlled using precisely tuned laser fields.
Credit: David Nadlinger Scientists have created a new way to generate powerful quantum interactions, achieving the first-ever demonstration of quadsqueezing. This breakthrough makes previously hidden quantum effects visible and usable for advanced technologies.have achieved a major advance in quantum physics by demonstrating a new kind of interaction using a single trapped ion.
By carefully producing and controlling increasingly complex forms of “squeezing” – including a fourth-order effect called quadsqueezing – the team has made quantum behaviors observable that had previously been out of reach. The method also introduces a new way to design and control these interactions, with possible applications in quantum simulation, sensing, and computing. The findings were published on May 1 inMany systems in physics behave like tiny vibrating objects, similar to springs or pendulums.
In the quantum world, these are called quantum harmonic oscillators. This framework can describe light waves, molecular vibrations, and even the motion of a single trappedThe ability to control these oscillations is essential for a range of quantum technologies, including extremely sensitive measurement devices and emerging quantum computers. Artist’s impression of two non-commuting forces generating nonlinear interactions. Their combined action produces richer dynamics than either force alone.
Credit: Eliza WolfsonOne widely used method for controlling quantum oscillators is known as squeezing. In quantum mechanics, there are limits on how precisely certain pairs of properties, such as position and momentum, can be measured at the same time. Squeezing redistributes this uncertainty, allowing one property to be measured more precisely at the cost of increased uncertainty in the other. Standard squeezing is only part of a broader class of interactions.
Physicists have long aimed to create more complex versions, including trisqueezing and quadsqueezing. These higher-order effects are much harder to achieve because they are naturally very weak and become even weaker as the order increases.
As a result, they are often lost to noise before they can be detected. To overcome this challenge, the Oxford team developed a new approach. Instead of directly trying to produce a weak higher-order interaction, they combined two precisely controlled forces acting on a single trapped ion. This method follows a theory proposed in 2021 by Dr. Raghavendra Srinivas and Robert Tyler Sutherland.
Each force alone produces a simple, predictable effect. When used together, however, they create a stronger interaction that goes beyond their individual contributions. This effect arises from non-commutativity, where the forces influence each other in a way that amplifies the resulting motion of the ion. Lead author, Dr. Oana Băzăvan, Department of Physics, University of Oxford, said: “In the lab, non-commuting interactions are often seen as a nuisance because they introduce unwanted dynamics.
Here, we took the opposite approach and used that feature to generate stronger quantum interactions. ”Using the same experimental setup, the researchers were able to switch between different types of squeezing. They produced standard squeezing, trisqueezing, and, for the first time on any platform, quadsqueezing, a fourth-order interaction. By adjusting the frequencies, phases, and strengths of the applied forces, they could control which interaction appeared while reducing unwanted effects.
Dr. Oana Băzăvan said: “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. 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.
”The team confirmed their results by reconstructing the quantum motion of the trapped ion. Their measurements revealed distinct patterns linked to second-, third-, and fourth-order squeezing. These patterns served as clear evidence that each type of interaction had been successfully produced. The researchers are now applying this method to more complex systems that involve multiple modes of motion.
Because the technique uses tools that are already available in many quantum platforms, it could become a widely applicable method for studying advanced quantum behavior. The approach has already been combined with mid-circuit measurements of the ion’s spin to create flexible superpositions of squeezed states and to simulate a lattice gauge theory.
Study co-author Dr. Raghavendra Srinivas , who supervised the work, said: “Fundamentally, we have demonstrated a new type of interaction that lets us explore quantum physics in uncharted territory, and we are genuinely excited for the discoveries to come. ” Reference: “Squeezing, trisqueezing and quadsqueezing in a hybrid oscillator–spin system” by O. Băzăvan, S. Saner, D. J. Webb, E. M. Ainley, P. Drmota, D. P. Nadlinger, G. Araneda, D. M. Lucas, C. J. Ballance and R. Srinivas, 1 May 2026,Scientists Discover How Coffee Impacts Memory, Mood, and Gut HealthMezcal “Worm” in a Bottle Mystery: DNA Testing Reveals a Surprise
Quantum Mechanics Trapped-Ion Setup Quantum Interactions Squeezing Quadsovereasing Quantum Technology
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