Adelaide University improves quantum sensors for medical use

Researchers at Adelaide University have made significant advancements in quantum sensing, particularly in the design of superconducting quantum interference devices (SQUIDs). Published on October 27, 2026, in the journal Physical Review Applied, the research introduces a simpler design that enhances the sensitivity of these devices, which are essential for medical diagnostics, brain imaging, and advanced communication technologies. The lead researcher, Associate Professor Giuseppe Tettamanzi, highlighted the potential of this breakthrough to open new possibilities in quantum sensing.

Superconducting quantum interference devices are known for their remarkable sensitivity to electromagnetic fields. They are widely utilized in specialized applications, including brain imaging systems and scientific instruments. However, traditional SQUIDs have struggled with accurately detecting when a magnetic field is precisely zero, which has limited their performance. Until now, engineers relied on complex circuits with variously sized superconducting loops to address this issue, often sacrificing overall sensitivity in the process.

The Adelaide team, which includes PhD students Ross Monaghan and Jonathan Marenkovic, found a more efficient solution by employing 'bare loops' in their design. Rather than varying the sizes of loops, the researchers replaced some with these bare loops that do not contain Josephson junctions, typically found in traditional SQUIDs. This innovative approach creates a synthetic area spread, enabling the sensor to act as though it has multiple differently sized loops without the added complexity.

The implications of this research extend beyond improved sensor performance. The enhanced sensitivity of superconducting quantum sensors could transform medical diagnostics, leading to more accurate brain monitoring systems and advancements in low-noise communication technologies. The ability to detect very weak signals with greater precision paves the way for new research opportunities and applications across various fields, including industry and defense.

Looking ahead, the researchers believe this breakthrough brings practical quantum-limited sensors closer to reality. Although further testing is needed before commercialization, the new design has already generated interest in potential applications across different sectors. The concept is currently under an international patent application, and the team is actively pursuing additional studies to enhance device performance and explore new uses for this technology. The future of quantum sensing appears promising, with the potential to impact numerous areas of science and technology.