Crypto news

A team of physicists 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 external magnetic fields, the researchers propose pre-"programming" atoms with light, opening new horizons for quantum computing and communications.

The essence of the method is as follows: a light beam first sets a specific state for the atoms, after which this pre-prepared atomic medium begins to actively influence the shape and polarization of complex laser beams. The key element of the model is optical vortices — beams with a spiral wavefront structure. In their "core," intensity drops to zero, and the size of this dark region is determined by the topological charge, which, according to the authors, "is not limited and can take any positive and negative integer values."

The practical potential of this concept is impressive: up to 10,000 different states can be obtained, allowing information to be encoded in qudits — multi-level units of quantum information that are a generalization of familiar qubits. This provides a significant advantage in the density and complexity of processed data.

How it works: interaction of light and atomic gas

To control vector vortices, the researchers modeled the interaction of a 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 areas, atoms strongly absorb radiation, while in others they become almost transparent. A feedback loop emerges — the atomic response reshapes the beam itself. Instead of a simple ring structure, a petal-like pattern appears with several bright areas around the center, and the polarization structure also changes. Previously, such control required powerful external magnetic fields and complex equipment.

Theoretically, this development paves the way for faster quantum processors, highly secure quantum communication networks, and ultra-precise optical sensors. Eliminating magnetic fields significantly simplifies the design and reduces the energy consumption of such devices.

My analysis: This approach is an elegant step forward in the field of photon-atom interaction. If the model is successfully implemented in practice, we may see a new class of quantum devices where control is achieved exclusively with light, making them more compact and stable compared to modern counterparts. This is especially important for creating distributed quantum networks.