Squeezing light boosts sensor precision in quantum magnetometers

Asghar Ullah of Koç University and Özgür E. Müstecaplıoğlu of Koç University and TÜBITAK Research Institute for Fundamental Sciences report a method for significantly enhancing the precision of quantum sensors. Their work demonstrates that a coupled two-resonator system, used to estimate both temperature and magnetic fields with measurements taken on a single resonator, can surpass fundamental precision limits imposed by vacuum fluctuations. The researchers found that within the system’s quadratic interactions naturally induce squeezing, yielding orders-of-magnitude enhancement in sensitivity in low-temperature and weak-field regimes compared to standard approaches. Counter-rotating terms within the interaction between coupled resonators naturally induce squeezing, a phenomenon that enhances the precision of quantum sensors at low…