PUBLICATIONS

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.

Q.-Y. Cao, P.-C. Yang, M.-S. Gong, M. Yu, A. Retzker, M.B. Plenio, C. Müller, N. Tomek, B. Naydenov, L.P. McGuinness, F. Jelezko, and J.-M. Cai, Phys. Rev. Applied 13, 024021 (2020)

Here we demonstrate energy-efficient protection of N-V spin coherence in nanodiamonds using concatenated continuous dynamical decoupling, which exhibits excellent performance with a less-stringent microwave-power requirement.

Yaoming Chu, Yu Liu, Haibin Liu, and Jianming Cai, Phys. Rev. Lett. 124, 020501 (2020)

Here, we propose a strategy to realize a single-qubit pseudo-Hermitian sensor from a dilated two-qubit Hermitian system. The pseudo-Hermitian sensor exhibits divergent susceptibility in a dynamical evolution that does not necessarily involve an exceptional point.

Pengcheng Yang, Min Yu, Ralf Betzholz, Christian Arenz, and Jianming Cai, Phys. Rev. Lett. 124, 010405 (2020).

Beyond quantum-state tomography, we outline how this principle can be leveraged to characterize and control quantum processes in cases where the system model is not known.

Min Yu, Pengcheng Yang, Musang Gong, Qingyun Cao, Qiuyu Lu, Haibin Liu, Shaoliang Zhang, Martin B Plenio, Fedor Jelezko, Tomoki Ozawa, Nathan Goldman, Jianming Cai, National Science Review 7: 254-260, 2020.

Our results establish coherent dynamical responses as a versatile probe for quantum geometry, and they pave the way for the detection of novel topological phenomena in solid state.

Yu Liu, Jiazhao Tian, Ralf Betzholz, and Jianming Cai, Phys. Rev. Lett. 122, 110406 (2019)

We propose a novel strategy to reconstruct the quantum state of dark systems, i.e., degrees of freedom that are not directly accessible for measurement or control. Our scheme relies on the quantum control of a two-level probe that exerts a state-dependent potential on the dark system.

Z.-J. Shu, Yu Liu, Qingyun Cao, Pengcheng Yang, Shaoliang Zhang, Martin B. Plenio, Fedor Jelezko, and Jianming Cai, Phys. Rev. Lett. 121, 210501 (2018)

The demonstrated rich Floquet dynamics offers new capabilities to achieve effective Floquet coherent control of a quantum system with potential applications in various types of quantum technologies based on driven quantum dynamics.

Haibin Liu, Martin B. Plenio, and Jianming Cai, Physical Review Letters. 118, 200402 (2017)

We demonstrate theoretically that it is possible to detect the effect of the geomagnetic field on the radical pair reaction and propose the present scheme as a possible hybrid model chemical compass.

I. Baumgart, J.-M. Cai, A. Retzker, M. B. Plenio, and Ch. Wunderlich, Phys. Rev. Lett. 116, 240801 (2016)

Based on the principle demonstrated here, this unprecedented sensitivity combined with spatial resolution in the nanometer range and tunability from direct current to the gigahertz range could be used for magnetic imaging in as of yet inaccessible parameter regimes.