Author(s): Nishchay Suri, Zhihui Wang, Tanay Roy, Davide Venturelli, and Wibe Albert de Jong We present a quantum sensing protocol for coupled qubit-oscillator systems that surpasses the standard quantum limit (SQL) by exploiting a geometrical phase. The signal is encoded in the geometrical phase that is proportional to the area enclosed in oscillator phase space. This area is amplified thr… [Phys. Rev. Lett. 137, 170802] Published Wed Oct 21, 2026