Quantum computers have achieved a significant breakthrough in the field of physics by simulating particle ‘string breaking’. This advancement brings physicists one step closer to utilizing quantum computers for simulations that are beyond the capabilities of traditional computers.
Two teams of physicists have successfully used quantum computers to mimic the phenomenon of subatomic particles such as quarks pairing up when connected by ‘strings’ of force fields. These strings release energy when they are pulled to the point of breaking. The results of these simulations were published in two papers in Nature on June 4, marking a significant milestone in the field of quantum computing.
Christian Bauer, a physicist at the Lawrence Berkeley National Laboratory, emphasized the importance of understanding string breaking from first principles. While classical computers can calculate the final outcomes of particle collisions involving string breaking, they are unable to fully simulate the process. The success of these quantum simulations is a promising development in the field of quantum computing.
The experiments were conducted by international collaborations involving academic and industry researchers. One team utilized QuEra Computing’s Aquila machine, which encoded information in atoms arranged in a 2D honeycomb pattern. These atoms were suspended in place by optical ‘tweezers’, with each atom representing the electric field at a specific point in space. The other team employed Google’s Sycamore chip to encode the 2D quantum field in the states of superconducting loops.
The two teams employed different quantum simulation philosophies. QuEra’s approach involved analog quantum simulation, where atoms mimicked the behavior of the electric field and evolved towards lower energy states. On the other hand, Google’s machine used digital quantum simulation, manipulating superconducting loops to follow the evolution of the quantum field.
By setting up strings in the quantum field that acted as rubber bands connecting particles, the teams were able to observe the breaking of these strings. Depending on the parameters adjusted by the researchers, the strings could be stiff, wobbly, or break apart entirely.
While simulating strings in a 2D electric field has applications for studying material physics, the process is still far from fully simulating high-energy interactions like those in particle colliders. However, the rapid progress in quantum simulation is promising, with researchers exploring new approaches such as using qudits to enhance the power of simulations.
Overall, the latest advancements in quantum simulation demonstrate the potential of quantum computers to tackle complex physics problems that are beyond the reach of traditional computers. This article was originally published in Nature on June 5, 2025, showcasing the fast-paced evolution of quantum computing in the realm of physics.
