Real-time quantum control of spin-coupling damping and application in atomic spin gyroscopes

• DOI: 10.1016/j.xcrp.2024.101832
• Publication Date: 2024-02-13T15:34:03Z
• Authors: Hongyu Pei; Lihong Duan; Longyan Ma; Shimiao Fan; Ze Cai; Zhihong Wu; Wenfeng Fan; Wei Quan
• Keywords: Quantum sensor; Spin quantum number

Integrating classical estimation and control theory with quantum systems holds potential for measurement improvement. Here, we report a real-time linear quadratic regulator (LQR) optimal spin damping in electron-nuclear spin-coupling regime. The aim is quicker response enhanced noise suppression precision measurements. Using Kalman observer electron data, estimate the state of nondirectly observable nuclear spin. LQR full-state feedback applied to achieve faster damping. Demonstrated an atomic gyroscope, our method significantly enhances dynamic 4.3-fold improvement rotational bandwidth. It also boosts long-term stability sensitivity by 62.9%, presenting promising avenue elevate ensemble performance