Potential Breakthrough in Quantum Computing: Researchers Edge Closer to Triplet Superconductors

The quest for more efficient and stable quantum computers may have taken a significant leap forward. Researchers at the Norwegian University of Science and Technology (NTNU) believe they have observed properties consistent with a “triplet superconductor,” a material long considered a holy grail in the field of quantum technology. This discovery, if verified, could pave the way for faster, more energy-efficient computers and advancements in spintronics.

What are Triplet Superconductors and Why Do They Matter?

Superconductors are materials that allow electricity to flow with no resistance, meaning no energy is lost as heat. Conventional superconductors, known as ‘singlet superconductors,’ are already used in various applications, but they have limitations. Triplet superconductors are different because the superconducting particles do carry spin, a fundamental property of electrons.

“A triplet superconductor is high on the wish list of many physicists working in the field of solid state physics,” said Professor Jacob Linder of NTNU’s Department of Physics, who leads the research at the QuSpin research center.

This spin characteristic is crucial. “The fact that triplet superconductors have spin has an important consequence. We can now transport not only electrical currents but as well spin currents with absolutely zero resistance,” explained Professor Linder. This ability to transmit information using spin without energy loss could revolutionize computing.

The NbRe Alloy and Initial Findings

The NTNU team, in collaboration with experimental researchers in Italy, focused on an alloy of niobium and rhenium (NbRe). Their research, published in Physical Review Letters, suggests that NbRe exhibits properties consistent with triplet superconductivity. The paper was selected as one of the journal’s editor’s recommendations.

“In our published article, we demonstrate that the material NbRe exhibits properties consistent with triplet superconductivity,” said Professor Linder. However, Linder cautions that further verification is needed. “It is still too early to conclude once and for all whether the material is a triplet superconductor. Among other things, the finding must be verified by other experimental groups. It is also necessary to carry out further triplet superconductivity tests.”

Relatively High Superconducting Temperature

Another promising aspect of NbRe is its superconducting temperature. It superconducts at 7 Kelvin (K), which is just above absolute zero (-273.15 degrees Celsius). Even as still extremely cold, 7K is considered relatively high in the field of superconductivity, making it more practical than materials requiring temperatures closer to 1K.

Professor Jacob Linder and the QuSpin Center

Jacob Linder has been a Professor of Physics at NTNU since 2013, receiving his Ph.D. In physics in 2009. His research focuses on the quantum physics that emerges when combining materials with different properties, particularly those with superconducting or magnetic characteristics. He is a principal investigator at the QuSpin Center of Excellence at NTNU, established in 2017. He also serves as a Divisional Associate Editor for Physical Review Letters and contributes to the Great Norwegian Encyclopedia.

Looking Ahead

The findings from NTNU represent a potentially significant step towards realizing the full potential of quantum technology. While further research and verification are crucial, the observation of properties consistent with triplet superconductivity in NbRe offers a glimmer of hope for building more stable, efficient, and powerful quantum computers. The team continues to investigate the material’s properties and collaborate with other research groups to confirm their findings.