Precise control method of atom spin SERF (Self-Exchange Relaxation-Free) state for stabilizing atom spin device

Abstract

The invention relates to a precise control method of an atom spin SERF (Self-Exchange Relaxation-Free) state for stabilizing an atom spin device, which comprises the following steps that firstly, a precise equation is established for the atom spin SERF state, and a modulation method is adopted to measure the atom spin polarizability to establish a control target; then a control system model as precise as possible is established on the basis of an SERF model, and a parameter identification method is adopted to estimate unknown parameters of the model; and finally, according to the control target, a special structure design control law of the established model is fully used, i.e. the switching time, frequency, orientation and power of laser and the switching time of a modulation magnetic field are optimized, and the atom spin SERF state is precisely controlled in real time in accordance with a quantum control algorithm. By using the precise control method, the atom spin relaxation time is increased, and the problem of instability of scale factors of atom devices such as an atom spin gyroscope and an atom magnetometer based on the atom spin SERF effect is solved. The precise control method can be used for improving the long-time drift precision and the low-frequency sensitivity based on the SERF atom spin device.

Description

technical field [0001] The invention relates to a precise control method of atomic spin SERF (spin-exchange-free relaxation) state based on SERF atomic devices, which can be used to improve the scale factor of SERF-based atomic devices such as atomic spin gyroscopes and atomic magnetometers Excellent stability, long-term drift accuracy, and low-frequency sensitivity. Background technique [0002] Atomic devices based on SERF, such as atomic spin gyroscopes and atomic magnetometers, have attracted the attention of countries all over the world for their ultra-high precision and theoretical performance far exceeding the level of existing gyroscopes and magnetometers, and have attracted research in this field. upsurge. The realization of atomic spin SERF state is the key technology based on SERF atomic devices. Atomic spin SERF states are prone to depolarization effects under the interference of multiple physical fields such as optical fields, magnetic fields, and thermal fiel...

AI Technical Summary

Problems solved by technology

Atomic spin SERF states are prone to depolarization effects under the interference of multiple physical fields such as optical fields, magnetic fields, and thermal fields. , the control of the atomic spin SERF state is still in the open-loop control, without stability control, the atomic spin SERF state is prone to depolarization effect, which not only reduces the sensitivity of the SERF atomic device, but also the scale factor of the device due to The depolarization of the SERF state leads to a change in the electronic polarizability and a decrease in stability, which will inevitably lead to a decrease in the long-term drift accuracy and low-frequency performance of SERF-based atomic devices, which limits its application in certain fields.

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