biostudies-literatureWang YJNational Natural Science Foundation of China (National Science Foundation of China)1160https://www.ebi.ac.uk/biostudies/studies/S-EPMC12858863biostudies-literatureUnknown17(1)The dynamical trajectory of a dissipative Rydberg many-body system could be flipped under a microwave field driving, displaying an enhanced sensitivity. This is because the intersection of the folded hysteresis trajectories exhibits a sharp peak near the phase transition, amplifying the response to small changes in the microwave field. Here, we demonstrate an experiment of enhanced metrology through flipping the hysteresis trajectory in a cold atomic system, displaying an approach to improve sensitivity by the gap-closing points. By measuring the intersection points of hysteresis trajectories versus Rabi frequency of the microwave field, we quantify the equivalent sensitivity to be 1.6(5) nV cm^-1Hz^-1/2. The measurement is also dependent on the interaction time, opticaNature communicationsQuantum enhanced metrology based on flipping trajectory of cold Rydberg gases.PMC1285886362435018T2495253Ding DSShao SYZhang JZhang LHZhang ZYMa YLi QZhu DYWang YJYin YMLiu XGuo GCShi BSWang QFYu CChen HCHan TYLiu BFang QQNan JDfalseQuantum enhanced metrology based on flipping trajectory of cold Rydberg gases.The dynamical trajectory of a dissipative Rydberg many-body system could be flipped under a microwave field driving, displaying an enhanced sensitivity. This is because the intersection of the folded hysteresis trajectories exhibits a sharp peak near the phase transition, amplifying the response to small changes in the microwave field. Here, we demonstrate an experiment of enhanced metrology through flipping the hysteresis trajectory in a cold atomic system, displaying an approach to improve sensitivity by the gap-closing points. By measuring the intersection points of hysteresis trajectories versus Rabi frequency of the microwave field, we quantify the equivalent sensitivity to be 1.6(5) nV cm^-1Hz^-1/2. The measurement is also dependent on the interaction time, optica2026-01-01T00:00:00Z2026 Jan2026-06-17T04:52:58.783Z2026-06-17T03:07:57.039ZS-EPMC128588634152634410.1038/s41467-025-67921-z