Quantum breakthrough without magnets: physicists find a way to 'program' atoms with light
A group of researchers from the Faculty of Physics at Vilnius University has presented a theoretical model that fundamentally changes the approach to controlling quantum systems. The development is based on using structured light to "program" atoms—all without the usual external magnetic fields.
How "Light Programming" Works
The essence of the method lies in a two-stage process. First, a laser beam sets atoms to a specific state—a kind of "program." Then, this pre-prepared atomic medium begins to actively influence the shape and polarization of complex laser beams. Key elements here are optical vortices—beams with a spiral wavefront, where intensity drops to zero at the center.
The size of this dark region is determined by the topological charge, which, as the authors emphasize, "is not limited and can take any positive and negative integer values." In practice, this opens access to 10,000 different states. Instead of the familiar qubits with two states, we get qudits—multidimensional units of quantum information.
Feedback and a New Polarization Pattern
To control vector vortices, the scientists simulated the interaction of a beam with an atomic gas, where each atom has three energy levels. In such a model, the prepared medium literally "inherits" the spatial pattern of light: in some zones, atoms actively absorb radiation, while in others they become almost transparent. In response, the atomic medium restructures the beam itself—creating feedback.
The result is impressive: instead of a simple ring, a petal-like pattern forms with several bright areas around the center, and the polarization structure changes fundamentally. Previously, such control was only achieved using powerful external magnetic fields and bulky equipment.
Practical Prospects
Theoretically, this development paves the way for faster quantum processors, highly secure quantum communication networks, and ultra-precise optical sensors. In my assessment, if the model is confirmed experimentally, we could see compact and energy-efficient quantum devices that do away with bulky magnets—a serious step toward commercializing the technology.
For context: on June 17, Sandia National Laboratories and Quantinuum published a peer-reviewed paper on the 98-qubit quantum computer Helios. The Vilnius model offers an alternative path to scaling—through multidimensional qudits—which could provide a competitive edge in computing power.
My expert opinion: Eliminating magnetic fields is not just a technical detail but a paradigm shift. If this model can be implemented in practice, we will see quantum systems that are cheaper, easier to operate, and, more importantly, capable of processing information in tens of thousands of states simultaneously. Keep an eye on this lab—we may be on the verge of a new generation of quantum computing.