2024

Lei Xiao, Yaoming Chu, Quan Lin, Haiqing Lin, Wei Yi, Jianming Cai, Peng Xue, Phys. Rev. Lett. 133, 180801 (2024)

We confirm the basic mechanism by simulating the sensor-field dynamics using photon interferometry, and, as a concrete example, demonstrate the enhanced sensing of signals encoded in the setting angle of a wave plate.

Yaoming Chu, Xiangbei Li, Jianming Cai, Phys. Rev. Lett. 133, 110201（2024）

Entanglement, a hallmark of quantum mechanics, is a vital resource for quantum technologies. Generating highly entangled multipartite states is a key goal in current quantum experiments. We unveil a novel framework for understanding entanglement generation dynamics in Hamiltonian systems by quantum delocalization of an effective operator wavefunction on a correlation landscape. Our framework establishes a profound connection between the exponentially fast generation of multipartite entanglement, witnessed by the quantum Fisher information, and the linearly increasing asymptotics of hopping amplitudes governing the delocalization dynamics in Krylov space. We illustrate this connection using the paradigmatic Lipkin-Meshkov-Glick model and highlight potential signatures in chaotic Feingold-Peres tops. Our results provide a transformative tool for understanding and harnessing rapid entanglement production in complex quantum systems, providing a pathway for quantum enhanced technologies by large-scale entanglement.

Alon Salhov, Qingyun Cao, Jianming Cai, Alex Retzker, Fedor Jelezko, Genko Genov, Phys. Rev. Lett. : 132, 223601 (2024)

We achieve a tenfold coherence time extension by destructive interference of cross-correlated noise, improve control fidelity, and surpass the state-of-the-art sensitivity for high frequency quantum sensing, significantly expanding the applicability of noise protection strategies.

Min Yu, Xiangbei Li, Yaoming Chu, Bruno Mera, F. Nur Ünal, Pengcheng Yang, Yu Liu, Nathan Goldman, and Jianming Cai, National Science Review, 11, 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.

Jing-Wei Fan, Shuai-Wei Guo, Chao Lin, Ning Wang, Gang-Qin Liu, Quan Li and Ren-Bao Liu, Nano Lett. 24, 14806(2024 )

This work demonstrates quantum coherence control in diamond at temperatures up to 1400 K, marking one of the highest temperatures achieved for quantum control.

Xiaoyu Chen, Haibin Liu, Jianming Cai, Phys. Rev. A 110, 042220 (2024)

A new type of quantum needle model system can relax the requirement for radical pair lifetime by an order of magnitude, and retains a narrow functional window around the geomagnetic field. This provides evidence for identifying the possible physical mechanism for quantum needle in chemical compass model of avian magnetoreception.

Ning Wang

The book explores the materials engineering, properties, and applications of magnetic nanoparticles. This chapter specifically reviews the applications of magnetic nanoparticles in diamond quantum sensing, and also highlights how diamond quantum sensing can be utilized to investigate the magnetic properties of these nanoparticles.

Baiyi Yu, Ralf Betzholz, and Jianming Cai, Phys. Rev. Applied 22, 024032 (2024)

We introduce a novel approach for achieving strong coherent coupling between ions and electrons by using a wire data bus along with local parametric modulation of the electron trapping potential. Our approach addresses the challenges posed by their differing masses and charges, enables sympathetic cooling of trapped electrons and significantly enhances ion-ion coupling via electron mediation.

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.