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A Two-stage Optimization Method for Wide-range Single-electron Quantum Magnetic Sensing

Created by
  • Haebom

Author

Shiqian Guo, Jianqing Liu, Thinh Le, Huaiyu Dai

Outline

This paper presents a novel optimal sensing parameter design protocol for ultrasensitive, ultraweak magnetic field detection in quantum magnetic sensing. Conventional adaptive algorithms or formula-based search methods have limitations in efficiency or convergence to optimality when the signal of interest (SoI) range is wide and the quantum sensor is subject to physical constraints. To address these limitations, we propose a novel protocol that utilizes a two-stage optimization method. In the first stage, a Bayesian neural network with fixed sensing parameters is used to narrow the SoI range. In the second stage, a federated reinforcement learning agent is designed to fine-tune the sensing parameters within the reduced search space. Our evaluation under the challenging task of single-shot reading of NV-center electron spins within a limited total sensing time yields wide-range DC magnetic field estimation with significantly improved accuracy and resource efficiency compared to existing techniques.

Takeaways, Limitations

Takeaways:
We present a novel protocol that enables efficient and optimal quantum magnetic sensing even in situations with a wide range of signals of interest (SoI) and physical constraints of quantum sensors.
By combining Bayesian neural networks and federated reinforcement learning, we significantly improve accuracy and resource efficiency.
It performed well even in the difficult situation of single shot reading.
It can contribute to the advancement of NV-center-based quantum magnetic sensing.
Limitations:
The proposed protocol is specific to NV-center electron spins and may not be directly applicable to other quantum sensor systems.
Hyperparameter tuning in Bayesian neural networks and federated reinforcement learning can impact performance.
Additional evaluation of resistance to noise and interference in real-world environments is required.
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