Beating standard quantum limit via two-axis magnetic susceptibility measurement

Wang, Zheng-An1,2; Peng, Yi1,3; Yu, Dapeng3,4,5; Fan, Heng1,2,6,7

2022-03-01

10.1088/1674-1056/ac4229

Chinese Physics B   影响因子和分区

1674-1056

2058-3834

We report a metrology scheme which measures the magnetic susceptibility of an atomic spin ensemble along the x and z directions and produces parameter estimation with precision beating the standard quantum limit. The atomic ensemble is initialized via one-axis spin squeezing with optimized squeezing time and parameter phi (to be estimated) assumed as uniformly distributed between 0 and 2 pi while fixed in each estimation. One estimation of phi can be produced with every two magnetic susceptibility data measured along the two axes respectively, which has an imprecision scaling (1.43 +/- 0.02)/N (0.687 +/- 0.003) with respect to the number N of the atomic spins. The measurement scheme is easy to implement and is robust against the measurement fluctuation caused by environment noise and measurement defects.

quantum metrology spin-squeezing standard quantum limit fluctuation

SCI ; EI

英语

其他

National Natural Science Foundation of China["T2121001",11934018,"U1801661"] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB28000000] ; Key-Area Research and Development Program of GuangDong Province, China[2018B030326001] ; Guangdong Provincial Key Laboratory[2019B121203002] ; Science, Technology and Innovation Commission of Shenzhen Municipality["KYTDPT20181011104202253","2016ZT06D348"]

Physics

Physics, Multidisciplinary

WOS:000780060500001

IOP Publishing Ltd

20221712033600

Atoms ; Magnetism ; Parameter estimation ; Quantum theory

Magnetism: Basic Concepts and Phenomena:701.2 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

Web of Science

1.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China
3.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
4.Southern Univ Sci & Technol, Guangdong Prov Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China
5.Southern Univ Sci & Technol, Shenzhen Key Lab Quantum Sci & Engn, Shenzhen 518055, Peoples R China
6.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China
7.Songshan Lake Mat Lab, Dongguan 523808, Peoples R China

Wang, Zheng-An,Peng, Yi,Yu, Dapeng,et al. Beating standard quantum limit via two-axis magnetic susceptibility measurement[J]. Chinese Physics B,2022,31(4).

Wang, Zheng-An,Peng, Yi,Yu, Dapeng,&Fan, Heng.(2022).Beating standard quantum limit via two-axis magnetic susceptibility measurement.Chinese Physics B,31(4).

Wang, Zheng-An,et al."Beating standard quantum limit via two-axis magnetic susceptibility measurement".Chinese Physics B 31.4(2022).