Oxford University researchers simulated the Aharonov–Bohm effect using a hybrid quantum computer on September 25, 2026. By encoding magnetic flux into dynamical gauge fields with trapped ions, the team induced destructive interference that brought a moving quantum particle to a complete stop.
Quantum mechanics often defies everyday intuition, allowing phenomena that have no direct counterpart in the physical world. In 1959, physicists Yakir Aharonov and David Bohm predicted that a charged particle traveling around a region containing a magnetic field would experience a measurable change in its quantum phase, even if its path never physically crossed the field itself. Decades later, researchers at the University of Oxford recreated this foundational principle in a controlled quantum system, demonstrating how an invisible magnetic influence can bring a simulated particle’s movement to a complete stop.
Building a Trapped-Ion Hybrid Quantum Experiment at Oxford
The project began in 2022 when Sebastian Saner, Dr. Oana Bazavan, and their colleagues started developing a way to simulate complex lattice gauge theories. These mathematical frameworks describe how matter interacts with fields associated with fundamental forces, representing space as a grid where matter sits at individual points and fields live on the connections between them. Simulating these systems on classical computers quickly becomes extraordinarily demanding as the grid grows. To bypass this computational bottleneck, the Oxford team built a hybrid quantum computer.
The experimental setup relied on two distinct quantum components derived from the same trapped ions. Qubits encoded in the internal states of trapped ions represented the gauge fields, while quantum oscillators created by the vibrational motion of those same ions represented matter. By connecting two oscillators with two qubits, the researchers formed a closed loop—the elementary building block of the lattice gauge theory.
Dynamical Gauge Fields Enable Matter and Flux Dynamics
To simulate magnetic flux piercing the loop, the team prepared the two qubits in an entangled quantum state. While encoding the flux this way initially served as a practical hardware workaround because the system could not easily provide a fixed background interaction, it ultimately opened the door to a more advanced physical investigation.
“For us, the exciting step was to encode the magnetic flux in a gauge field that was itself dynamical. Rather than having matter evolve in a fixed background, the matter and gauge field become part of the same quantum dynamics.”
Sebastian Saner
When the researchers allowed a matter particle to move between locations via quantum tunneling without any simulated flux present, the particle moved freely around the loop. Introducing the simulated magnetic flux changed the relative quantum phases of the two possible paths. This phase shift caused the paths to interfere destructively, canceling out their quantum contributions entirely and freezing the simulated particle in its original starting state.
Nature Physics Publishes Hybrid Quantum Architecture Findings
The findings appeared open access in Nature Physics on September 25, 2026, under the title Aharonov–Bohm interference in a ℤ₂ lattice gauge theory on a hybrid qubit–oscillator quantum computer.
The publication highlights how hybrid quantum architectures can reproduce complex interactions that resist conventional modeling, offering a resource-efficient route toward scalable simulations in higher dimensions.
The Oxford study appeared alongside related work from a University of Maryland team led by Professor Norbert Linke, which independently developed an approach using a hybrid quantum system to simulate the Yukawa potential—an interaction relevant to nuclear and particle physics.