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MON: Monday Contributed Sessions

MON 20: Quantum Sensing and Decoherence: Contributed Session to Symposium II

MON 20.4: Talk

Monday, September 8, 2025, 17:15–17:30, ZHG009

Geometry of variational qubit dynamics with its applications on quantum control and sensing — •Xiu-Hao Deng — Shenzhen International Quantum Academy — Hefel National Lab

Quantum systems are fragile to perturbations from their environment. The variation of parameters brings deviation to the qubit dynamics. These variations may originate from noises, parameter uncertainty and weak signals to detect. We discover that the variational part of the qubit dynamics has beautiful geometric properties on its manifold, which includes space curves and areas. By applying the geometric theory to suppress the errors generated by noise, we find that the space curves on the manifold of the variational quantum dynamics should be close and encircle vanishing areas. Using this theory, we have obtained very robust quantum gates and quantum circuits. On the other hand, to obtain enhanced sensing, the curves should be far from the origin. We have also demonstrated enhanced signal precision and sensitivity. I will also present some experimental results in this talk.

Keywords: Quantum Geometry; Noise; Quantum Sensing; Quantum Control; Quantum Dynamics