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Observation of string breaking on a (2 + 1)D Rydberg quantum simulator

The observation that certain fundamental particles, such as quarks, cannot be isolated but are instead bound in composite hadrons, such as protons or neutrons, is attributed to a phenomenon called confinement. According to quantum chromodynamics (QCD), an extensive amount of energy is stored in a flux string of gluon fields that confines, for example, a quark–anti-quark pair.
Observation of String Article

Publication Date: June 04, 2025

Authors: Daniel González-Cuadra, Majd Hamdan, Torsten V. Zache, Boris Braverman, Milan Kornjača, Alexander Lukin, Sergio H. Cantú, Fangli Liu, Sheng-Tao Wang, Alexander Keesling, Mikhail D. Lukin, Peter Zoller & Alexei Bylinskii

Abstract:

Lattice gauge theories (LGTs) describe a broad range of phenomena in condensed matter and particle physics. A prominent example is confinement, responsible for bounding quarks inside hadrons such as protons or neutrons. When quark–antiquark pairs are separated, the energy stored in the string of gluon fields connecting them grows linearly with their distance, until there is enough energy to create new pairs from the vacuum and break the string. Although these phenomena are ubiquitous in LGTs, simulating the resulting dynamics is a challenging task. Here we report the observation of string breaking in synthetic quantum matter using a programmable quantum simulator based on neutral atom arrays. We show that a (2 + 1)-dimensional LGT with dynamical matter can be efficiently implemented when the atoms are placed on a Kagome geometry, with a local U(1) symmetry emerging from the Rydberg blockade. Long-range Rydberg interactions naturally give rise to a linear confining potential for a pair of charges, allowing us to tune both their masses and the string tension. We experimentally probe string breaking in equilibrium by adiabatically preparing the ground state of the atom array in the presence of defects, distinguishing regions within the confined phase dominated by fluctuating strings or by broken string configurations. Finally, by harnessing local control over the atomic detuning, we quench string states and observe string-breaking dynamics exhibiting a many-body resonance phenomenon. Our work provides opportunities for exploring phenomena in high-energy physics using programmable quantum simulators.

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