Next-gen quantum sensors could be built as scientists overcome big hurdle

Scientists at the University of Sydney have developed a new quantum sensing protocol that overcomes limitations imposed by the Heisenberg uncertainty principle, enabling ultra-precise measurements of both position and momentum simultaneously. By effectively redistributing the unavoidable quantum uncertainty—pushing it into less critical areas—they can measure fine details with unprecedented sensitivity. This approach uses "grid states," quantum states initially designed for error-corrected quantum computing, applied to the tiny vibrational motion of a trapped ion, analogous to a quantum pendulum. This breakthrough allows measurements beyond the standard quantum limit achievable by classical sensors, potentially revolutionizing navigation in GPS-denied environments such as submarines, underground locations, or spaceflight. Additionally, it holds promise for enhancing biological and medical imaging, materials monitoring, gravitational system analysis, and fundamental physics research. While still experimental, this new framework complements existing quantum sensing technologies and could lead to next-generation sensors capable of detecting extremely subtle signals with high precision.