2024

Musang Gong, Jiahe Xu, Min Yu, Liyin Zhang, Qipeng Li, Ning Wang, and Jianming Cai, Phys. Rev. Applied 21, 024053 (2024)

We propose and demonstrate a hybrid quantum thermometer composed of bulk diamond with ensemble NV centers and gadolinium magnetic flux concentrators, achieving a submicrokelvin resolution. Near the critical point, the spin resonance to temperature is about 774 times enhanced compared with that of bare NV centers.

Min Yu, Xiangbei Li, Yaoming Chu, Bruno Mera, F. Nur Ünal, Pengcheng Yang, Yu Liu, Nathan Goldman, and Jianming Cai, National Science Review, nwae065 (2024)

Berry curvature and Chern numbers of band structures can set lower bounds on metrological properties. We experimentally verify such topological bounds for the first time and demonstrate strong metrological enhancement in topologically non-trivial regime. This work opens the door to metrological applications empowered by topology, with potential implications for quantum many-body systems.

Baiyi Yu, Yaoming Chu, Ralf Betzholz, Shaoliang Zhang, and Jianming Cai, Phys. Rev. Lett. 132, 073202 (2024)

By engineering electric potential of a trapped electron system, the motional states of the trapped electron can obtain giant electric dipole moments, exceeding those attainable with Rydberg atoms. This artificial electric dipole may provide a potential platform for quantum technologies such as ultrahigh-sensitivity electric-field sensing.

Ning Wang and Jianming Cai, Front. Phys. 12, 1320108 (2024)

Hybrid quantum sensing has emerged as a promising avenue for further enhancing the capabilities of diamond sensors. Different techniques can potentially improve the sensitivity, range of detectable parameters, and sensing frequencies of diamond sensors.