Researchers at University College Dublin and international collaborators have published a detailed tutorial in PRX Quantum designed to translate complex theoretical ideas into practical devices for quantum enhanced sensing technologies. While conventional sensors underpin technologies like GPS, quantum systems offer the best precision allowable by the laws of physics; the challenge has been their inherent fragility. The team focuses on ‘critical quantum sensing,’ utilizing a quantum system’s behavior, similar to water freezing into ice, to amplify tiny signals and overcome this limitation. “Quantum sensors operate at the edge of what the laws of physics allow, and they are already producing real results,” said Dr. George Mihailescu, a postdoctoral researcher in UCD School of Physics and UCD Centre for Quantum Engineering, Science and Technology (C-QuEST), noting their current application in gravitational wave detection through the LIGO experiment.
Critical Quantum Sensing Leverages Phase Transitions
A quantum system’s inherent instability, traditionally viewed as a limitation, is now being strategically harnessed to amplify the detection of incredibly faint signals. This approach, termed ‘critical quantum sensing,’ offers a pathway to more robust and sensitive measurement technologies. This guide is intended to bridge the gap between theoretical concepts and the creation of functional sensors, providing a resource for researchers seeking to implement ‘critical quantum sensing’ in their own experimental platforms. The core principle relies on exploiting a quantum system’s behavior, akin to the abrupt change when water freezes, to magnify minute variations; just as the phase transition from liquid to solid is easily observable, this sharp physical change within a quantum system can render previously undetectable signals far more prominent.
This technique addresses a significant challenge in quantum technology: fragility. By utilizing collective physical behaviors near quantum phase transitions, developers can create sensors that are more resilient to technical noise and decoherence, potentially enabling easier scalability for industrial applications. Beyond fundamental physics, the implications extend to advanced sensors for navigation and environmental monitoring, as well as breakthroughs in medical diagnostics and astronomical imaging, promising a broad impact across both scientific discovery and practical technologies. The project received joint funding from UKRI and Research Ireland-Taighde Eireann, under grant number 24/EPSRC/.
Enhanced Sensing Applications Across Diverse Fields
The pursuit of increasingly sensitive measurement tools is driving rapid advancements in quantum sensing, extending beyond theoretical exploration into tangible applications across multiple disciplines. This approach promises to deliver robust, high-performance sensors capable of operating in challenging environments. This is not merely a future prospect; the technology is already impacting major scientific endeavors. The potential for broader societal impact is substantial, ranging from improvements to everyday navigational tools and environmental monitoring systems to breakthroughs in medical diagnostics and advanced astronomical imaging.
Quantum sensors operate at the edge of what the laws of physics allow, and they are already producing real results” – including their application in major international research efforts such as the LIGO experiment for detecting gravitational waves.
Source: https://www.ucd.ie/research/news/2026/ucdphysicistsharnesspotentialofquantumphasetransitions/
