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Researchers have demonstrated that quadratic coupling in superconducting circuit optomechanical architectures naturally induces squeezing, allowing quantum magnetometers to surpass standard vacuum fluctuation limits. This advancement significantly enhances sensitivity for detecting weak magnetic fields and temperature changes in low-temperature regimes without requiring external squeezing resources. The work represents a fundamental improvement in sensor precision driven by intrinsic system interactions rather than conventional radiation-pressure coupling.

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Squeezing light boosts sensor precision in quantum magnetometers

Quantum ZeitgeistOctober 13, 20266 min read

Exploiting quadratic coupling, researchers found squeezing enhances sensor precision in quantum magnetometers, surpassing limits of standard optomechanical sensors.

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…

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