An international group of physicists from Chalmers University of Technology in Sweden has proposed a fundamentally new approach to building quantum systems that could significantly accelerate the development of fully functional and stable quantum computers. The study was published in the journal Physical Review Letters.

The Main Challenge in Quantum Technology

One of the most serious obstacles to the development of quantum computers remains Quantum Decoherence—a process in which qubits (quantum bits) rapidly lose their quantum information due to interaction with the surrounding environment, including noise, temperature fluctuations, and electromagnetic interference.

One of the study’s authors, Lei Du, explained that quantum systems are extremely powerful but also extremely fragile, adding that the key task is to learn how to control their interaction with the environment.

A New Concept: “Giant Superatoms”

The researchers combined two promising approaches—Giant Atoms and Superatoms—to create a hybrid system they called Giant Superatoms.

  • Giant atoms are artificial quantum systems that interact with their environment at multiple points simultaneously. Because of this, they can partially “remember” their previous states and better resist decoherence.
  • Superatoms are groups of ordinary atoms that behave as a single quantum object.

By combining these concepts, the researchers created a system capable of storing and processing quantum information from several qubits at once while remaining significantly more resistant to external disturbances.

New Opportunities for Quantum Computing

One of the most important tasks in quantum computing is the creation and maintenance of Quantum Entanglement, a state in which multiple qubits function as a single system. This entanglement is what gives quantum machines their extraordinary computational power. However, under real-world conditions, such states typically break down very quickly.

According to the authors, the new architecture allows entanglement to be preserved more effectively and enables quantum information to be transmitted over distances with minimal loss. The researchers proposed several practical schemes for operating giant superatoms, including exchanging states between them and synchronizing signal transmission.

Co-author Janine Splettstoesser noted that giant superatoms open entirely new possibilities for controlling quantum information.

What Comes Next

For now, the concept exists only as theoretical models and calculations. The next major step will be the experimental realization of giant superatoms in laboratory conditions. In the future, such systems could form the basis for hybrid quantum devices in which different types of qubits and technologies operate together.

In Brief

Scientists from Chalmers University of Technology have proposed a new concept for quantum systems known as Giant Superatoms. By combining the ideas of giant atoms and superatoms, they created an architecture that is significantly more resistant to Quantum Decoherence, the main challenge facing modern quantum computers. The new system enables more reliable storage and transmission of Quantum Entanglement states. Although the work is currently theoretical, it opens a promising path toward more stable and powerful quantum devices. The study was published in Physical Review Letters.