Crypto news

A team of researchers from the Faculty of Physics at Vilnius University has presented a theoretical model that fundamentally changes the approach to controlling quantum systems. Instead of the traditional use of bulky external magnetic fields, the scientists propose "programming" atoms using light. This opens the way to creating more compact, faster, and energy-efficient quantum devices.

The essence of the model is as follows: a light beam first tunes the atomic medium into a specific state, after which this pre-prepared medium begins to actively alter the shape and polarization of complex laser beams. Key elements here are optical vortices—beams with a spiral wavefront structure. At their center, the intensity drops to zero, forming a dark region whose size is determined by the so-called topological charge. This charge has no limitations and can take any positive or negative integer values.

From Qubits to Qudits: Exponential Growth in Information Capacity

In practice, this means we can obtain up to 10,000 different states. This allows encoding information in qudits—multilevel units of quantum information that are a generalization of familiar qubits. While a qubit operates with only two states (0 and 1), a qudit can exist in a superposition of dozens or hundreds of states, exponentially increasing computational power and the volume of transmitted data.

To control vector vortices, the researchers modeled the interaction of a laser beam with an atomic gas, where the atoms have three energy levels. In such a model, the prepared medium literally "inherits" the spatial pattern of light: in some regions, atoms actively absorb radiation, while in others they become almost transparent. A feedback effect occurs—the atomic response restructures the beam itself. Instead of a simple ring structure, a lobe-shaped pattern forms with several bright regions around the center, and the polarization structure itself is also transformed.

Previously, such control required powerful external magnetic fields and complex laboratory equipment. The new model theoretically opens the way to creating faster quantum processors, highly secure quantum communication networks, and ultra-precise optical sensors.

My professional commentary: This work is an elegant step toward the miniaturization and cost reduction of quantum systems. Abandoning magnetic fields not only simplifies the architecture but also addresses one of the key problems—decoherence caused by external interference. If the model is successfully implemented in practice, we will witness a paradigm shift in quantum computing and communications, where information will be processed and transmitted with unprecedented speed and reliability.