Thirteen Trapped Ions Simulate How Particles Can Spring From a Stretched Field of Force

Where did everything come from? Children ask it, and so do physicists, who turn it into a technical question: how does matter form out of raw energy? Pull two quarks apart and you get a piece of the answer. The force between them does not fade like gravity or magnetism. It behaves like a stretched string, and pull hard enough and the energy in it turns into new particles. Physicists call this string breaking, and calculating it from first principles is very hard for ordinary computers.

A team led by Arinjoy De and Christopher Monroe at Duke University’s Duke Quantum Center, with collaborators at the University of Maryland, NIST and other institutions in the US and Europe, used a simulator built from a chain of 13 trapped ytterbium ions to watch a simplified version of string breaking unfold. When they suddenly increased the tension on a string, new charge pairs appeared first near the string’s edges and then spread inward. The work was published in Nature Physics on September 23, 2026.

A few questions a reader might ask, answered from the paper.

Were these real quarks?

No. The team studied a stripped-down model from particle physics, a one-dimensional lattice gauge theory, keeping the key ingredients: charges, strings between them and confinement. The model is encoded in the ions, and laser beams control how they interact. Using beams that address individual ions, the team mimicked fixed charges and the strings connecting them.

What did they see?

First a warm-up that behaved as you would hope. With no string tension, isolated charges spread out freely. As the tension increased, they stayed put and oscillated in place, as if held on a short leash.

Then the surprise. The team stretched a string between two fixed charges and abruptly increased its tension. Charge pairs appeared near the edges of the string and then spread into its middle. The paper says this reveals a mechanism for string breaking distinct from the conventional Schwinger mechanism, the textbook picture of particle pairs appearing out of a strong field. It is the kind of result that makes a physicist sit up: a toy model still had something unexpected to say about where new matter shows up.

So is this quantum advantage?

No, and the paper is straightforward about it. At 13 ions, ordinary computers can still keep up. The team compared its measurements with numerical simulations on classical computers and reports good agreement. That agreement is the point at this stage: it shows the method gives right answers where they can be checked, before anyone pushes it to sizes where checking runs out.

Then why use a quantum machine?

Because of where this is going. Simulating string breaking from first principles means solving the quantum many-body dynamics of the strong force, and the paper notes quantum simulators may outperform classical methods at that task. Classical sampling methods have computed static string breaking in the theory of the strong force, the authors write, but are severely inefficient at simulating how strings evolve over time. The ion chain does not grind through the answer step by step. It follows the same quantum rules as the model, and the experimenters watch it unfold in space and time, ion by ion.

What does it give the rest of us?

Understanding, which is not a small thing to be given. How matter forms from raw energy connects particle colliders to the first moments after the Big Bang, which is to say to how there came to be anything at all, including us. Duke’s release says the researchers expect quantum machines to overtake classical ones as these experiments scale up, which could eventually help study how matter formed after the Big Bang. Nothing here will show up in a hospital or a power grid. It could show up in a textbook, and in the answer a teacher gives the next student who asks where everything came from.

For now, hold on to the small picture: a row of 13 ions, a string pulled tight between two of them, and new pairs blinking into being at the ends rather than the middle. Somebody looked, and the universe was more interesting than the diagram said.