For decades, physicists have hunted for a material that can transport both electrical charge and electron spin without losing energy. Conventional superconductors — the ones used in MRI machines and particle accelerators — already allow electricity to flow with zero resistance. But they have a fundamental limitation: the paired electrons that carry the current have opposite spins, canceling out any spin signal.
Triplet superconductors are different. In these materials, electron pairs carry aligned spins, meaning spin currents can travel alongside electrical currents — both with zero resistance. This property, known as spin-triplet superconductivity, has been called the "holy grail" of quantum technology.
What Makes NbRe Special
Researchers at the Norwegian University of Science and Technology (NTNU), led by Professor Jacob Linder, have found strong evidence that an alloy of niobium and rhenium — NbRe — exhibits triplet superconducting behavior. In experiments conducted with collaborators in Italy, the material showed electrical resistance flipping in the opposite direction of what conventional superconductors would produce — a hallmark signature of triplet pairing.
"We think we may have observed a triplet superconductor," said Professor Linder. "Materials that are triplet superconductors are a kind of holy grail in quantum technology, and more specifically quantum computing."
Why It Matters for Quantum Computing
Today's quantum computers face a critical stability challenge. Quantum bits, or qubits, are extremely sensitive to their environment. The slightest interference can cause errors, and error correction currently requires thousands of physical qubits to create a single logical one.
Triplet superconductors could change this by enabling topological qubits — a type of qubit that is naturally protected from environmental noise. Because spin currents can flow without resistance, quantum operations could be performed with dramatically higher accuracy. The technology could also slash energy consumption, potentially enabling ultra-fast computers that run on almost no electricity.
What Comes Next
The results, published in Physical Review Letters and selected as an editor's recommendation, are promising but not yet conclusive. The finding must be verified by other experimental groups, and further tests are needed to confirm triplet superconductivity beyond doubt.
Even so, the discovery represents a major step forward. If confirmed, NbRe — or the broader family of materials it points toward — could become a cornerstone of next-generation quantum and spintronic technology, bringing us closer to practical, fault-tolerant quantum computers.