PUBLICATIONS

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.

Yaoming Chu and Jianming Cai, Nature Physics 19, 933 (2023) (News & Views)

A quantum engineering technique powered by disorder ofers access to local correlation functions down to single-site resolution in nuclear spin ensembles, allowing the study of both spin and energy hydrodynamics.

Yaoming Chu, Xiangbei Li and Jianming Cai, Phys. Rev. Lett. 130, 170801（2023）

Our main result establishes a strong precision limit of quantum metrology accounting for the complexity of many-body quantum resource state preparation and reveals a fundamental constraint for reaching the Heisenberg limit.

Yaoming Chu and Jianming Cai, Phys. Rev. Lett.128.200501 (2022)

Here, we establish such a physical principle for energy consumption in order to achieve a certain level of measurement precision in quantum metrology, and show that it is intrinsically determined by the erasure of quantum Fisher information.

Min Yu, Yu Liu, Pengcheng Yang, Musang Gong, Qingyun Cao, Shaoliang Zhang, Haibin Liu, Markus Heyl, Tomoki Ozawa, Nathan Goldman and Jianming Cai, npj Quantum Inf. 8, 56 (2022)

We experimentally demonstrate near saturation of the quantum Cramér–Rao bound in the phase estimation of a solid-state spin system, provided by a nitrogen-vacancy center in diamond.

Yaoming Chu, Shaoliang Zhang, Baiyi Yu, and Jianming Cai, Phys. Rev. Lett. 126, 010502 (2021)

We propose a dynamic framework for quantum sensing with a family of Hamiltonians that undergo quantum phase transitions (QPTs). By giving the formalism of the quantum Fisher information (QFI) for quantum sensing based on critical quantum dynamics, we demonstrate its divergent feature when approaching the critical point.