Quantum simulator captures Aharonov–Bohm effect

Researchers used a trapped-ion quantum computer to simulate a small lattice gauge theory and observe Aharonov–Bohm interference with dynamic gauge fields. The hybrid device encoded gauge fields in qubits and matter in the ions’ vibrational modes. ^[1]

In a two-link loop, the team prepared gauge-field states corresponding to zero or π magnetic flux. With π flux, matter tunnelling was suppressed by destructive interference; with zero flux, the excitation moved between sites. The researchers also observed dynamics consistent with Gauss’s law in a simpler, single-link setup. ^[1]

The experiment demonstrates a way to encode and evolve this model on a quantum device, which could help researchers study lattice gauge theories whose behavior is difficult to calculate classically. It is a small-scale demonstration, not evidence that larger simulations or practical applications are already within reach. ^[1]