Technique of Noise Reduction in Optical Polarimetry with Spin-alignment and Optical Sweeping | Chapter 1 | Current Research Progress in Physical Science Vol. 9

Quantum non-demolition measurement with an off-resonance polarized probe is a widely utilized technique for atomic sensors. Typically, QND instruments read out spin states through optical polarimetry using a linearly off-resonance probe in atomic media. This optical read-out process offers high accuracy, with potential applications in biomagnetism, inertial navigation and new physics exploration beyond the standard model. It was observed that previously unexplored spin-alignment polarization induced by the far-detuned off-resonance linear probe in an ultrasensitive optical polarimetry. The evolution of probe-generated multipole moments exacerbates probe noise due to strong magnetic couplings.  A method was demonstrated to decouple spin-alignment from magnetic fields by manipulating the multipole moments in zero fields. A suppression of the probe noise by 8.2 dB at 1 Hz and 10.4 dB at 10 Hz with the proposed method, reaching the standard quantum limit, was achieved. The realized shot-noise-limited optical polarimetry shows significant potential for advancing the performance of atomic sensors, particularly in applications requiring ultra-high sensitivity, such as precision measurements and quantum metrology. These findings provide a pathway toward enhanced sensor precision in diverse scientific and technological applications.

 

Author (s) Details

Xing Heng

School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China and Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China.

 

 

Xiaofei Huang
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China and Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China.

 

Weiyi Wang
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China and Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China.

 

Fan Wang
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
and Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China.

 

Dinghui Gong
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China and Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China.

 

Chang Liu
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China
and Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China.

 

Guoqing Tian
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China and Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China.

 

Jie Zheng
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China and Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China.

 

Yueyang Zhai
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China, Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China and Hefei National Laboratory, Hefei, 230088, Anhui, China.

 

Kai Wei
School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China, Hangzhou Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology, Hangzhou Innovation Institute, Beihang University, Hangzhou 310051, Zhejiang, China and Hefei National Laboratory, Hefei, 230088, Anhui, China.

 

Please see the book here:- https://doi.org/10.9734/bpi/crpps/v9/4601