Quantum Metrology

We explore quantum-enhanced metrology using optical lattice clocks and Floquet-engineered systems. Our research covers high-precision Rabi spectroscopy, interference of Floquet modes, Rydberg Atom Interferometry, and the application of quantum many-body states to improve measurement sensitivity beyond classical limits.

Optical Lattice Clock

We develop high-precision optical lattice clocks using Floquet engineering and quantum control techniques, together with the national time service center (NTSC). Our work includes Rabi spectroscopy, Floquet mode interference, Landau-Zener dynamics, and the study of density shifts in multi-band systems for achieving ultra-stable frequency standards.

Publications:

  • Mo-Juan Yin, Xiao-Tong Lu, Ting Li, Jing-Jing Xia, Tao Wang*, Xue-Feng Zhang*, and Hong Chang*, "Floquet Engineering Hz-Level Rabi Spectra in Shallow Optical Lattice Clock", Phys. Rev. Lett. 128, 073603 (2022)
  • Xiao-Tong Lu, Tao Wang, Ting Li, Chi-Hua Zhou, Mo-Juan Yin, Ye-Bing Wang, Xue-Feng Zhang*, and Hong Chang*, "Doubly Modulated Optical Lattice Clock: Interference and Topology", Phys. Rev. Lett. 127, 033601 (2021)
  • Wei-Xin Liu, Xiao-Tong Lu, Ting Li, Xue-Feng Zhang, Hong Chang, Tao Wang*, and Wei-Dong Li, "Degenerate Rabi spectroscopy of the Floquet engineered optical lattice clock", Phys. Rev. A 107, 013315 (2023)
  • Wei-Xin Liu, Tao Wang*, Xue-Feng Zhang, and Wei-Dong Li, "Time-domain Landau-Zener-Stuckelberg-Majorana interference in an optical lattice clock", Phys. Rev. A 104, 053318 (2021)
  • Mo-Juan Yin, Tao Wang, Xiao-Tong Lu, Ting Li, Ye-Bing Wang, Xue-Feng Zhang*, Wei-Dong Li*, Augusto Smerzi*, and Hong Chang*, "Rabi Spectroscopy and Sensitivity of a Floquet Engineered Optical Lattice Clock", Chinese Phys. Lett. 38, 073201 (2021)
  • Wei Tan, Wei-Xin Liu, Ying-Xin Chen, Chi-Hua Zhou, Guo-Dong Zhao, Hong Chang*, Jun Dai*, and Tao Wang*, "Realization of Landau-Zener Rabi oscillations on an optical lattice clock", Phys. Rev. A 111, 033102 (2025)
  • Sheng-Xian Xiao, Ying Liang, Ya Zhang, and Tao Wang*, "Gravity measurement at the sub-millimeter scale with optical lattice clock", Appl. Phys. Lett. 124, 094002 (2024)
  • Ruo-Shui Han, Wei Wang*, and Tao Wang*, "A proposal for detecting weak electromagnetic waves around 2.6 µm wavelength with Sr optical clock", Chin. Phys. B 33, 043201 (2024)
  • Du-Yi Ou-Yang, Yan-Hua Zhou, Ya Zhang, Xiao-Tong Lu, Hong Chang, Tao Wang*, and Xue-Feng Zhang*, "Interference Pattern of Floquet Modes in Frequency Space", Chinese Phys. Lett. 42, 060601 (2025)

Rydberg Atom Interferometry

We develop Rydberg atom-based quantum sensors for precision measurements of electric fields and microwave signals. Our work includes Floquet electromagnetically induced transparency, phase-sensitive interferometry, and DC/power-frequency electric field sensing using Rydberg states in atomic ensembles.

Publications:

  • Yingying Han*, Changfa He, Peng Xu, Yanting Zhao, Tao Wang*, and Weidong Li*, "Phase-sensitive Rydberg-atom interferometry with Floquet electromagnetically induced transparency", Phys. Rev. Applied 24, 024063 (2025)
  • Yingying Han*, Changfa He, Zhenxiong Weng, Peng Xu, Yanting Zhao, Tao Wang*, "DC and power-frequency electric field measurement with Rydberg-atom interferometry", Appl. Phys. Lett. 127, 024002 (2025)
  • Weixin Liu, Linjie Zhang*, and Tao Wang*, "Atom-based power-frequency electric field measurement using the radio-frequency-modulated Rydberg spectroscopy", Chin. Phys. B 32, 053203 (2023)
  • Xin Jia, Weixin Liu, Shengxian Xiao, Zimo Zhang, Bin Huang, Tao Wang*, Bing Chen*, and Heng Shen*, "Coherent dressing of ground-state spin in a thermal atomic ensemble", Phys. Rev. Research 6, 043247 (2024)

Floquet Engineering

We apply Floquet engineering to quantum systems for realizing novel quantum states and topological phases. Our work includes periodic driving of optical lattices, simulation of gauge fields, realization of exotic spin configurations in spin-orbit-coupled systems, and the study of non-adiabatic geometric phases in driven two-level systems.

Publications:

  • Tao Wang and Xue-Feng Zhang*, "Quantum phase transition of the Bose-Hubbard model with anisotropic hopping on a cubic lattice", Phys. Rev. B 102, 024522 (2020)
  • Tao Wang, Shi-Jie Hu*, Sebastian Eggert, Michael Fleischhauer, Axel Pelster, and Xue-Feng Zhang, "Floquet-induced superfluidity with periodically modulated interactions of two-species hardcore bosons in a one-dimensional optical lattice", Phys. Rev. Research 2, 013275 (2020)
  • Wei Wang, Zheng Zhang, Gui-Xin Tang, and Tao Wang*, "Floquet engineering tunable periodic gauge fields and simulating real topological phases in a cold-alkaline-earth-metal-atom optical lattice", Phys. Rev. A 110, 023308 (2024)
  • Wei-Xin Liu, Tao Wang*, and Wei-Dong Li, "Nonadiabatic geometric phase in a doubly driven two-level system", Chin. Phys. B 32, 050311 (2023)
  • Yida Chu, Shi-Jie Hu*, and Tao Wang*, "Realization of a period-3 coplanar state in one-dimensional spin-orbit-coupled optical lattices", Phys. Rev. A 111, L011304 (2025)