TY - JOUR

T1 - Method for phase extraction from atom interference fringes via orthogonal subspace projection

AU - Lei, Jiaqi

AU - Jiang, Junjie

AU - Yan, Sitong

AU - Hou, Zhuo

AU - He, Chuan

AU - Xu, Rundong

AU - Zhou, Lin

AU - Wang, Jin

AU - Prudnikov, Oleg Nikolaevich

AU - Yudin, Valeriy

AU - Zhan, Mingsheng

N1 - This work was supported by the Quantum Science and Technology-National Science and Technology Major Project (Grant No. 2021ZD0300603), the National Natural Science Foundation of China (Grant Nos. W2412045, 12174403, 12304547, and 12304549), the Chinese Academy of Sciences Project for Young Scientists in Basic Research (Grant No. YSBR-055), the Hubei Provincial Science and Technology Major Project (Grant No. ZDZX2022000001), the Natural Science Foundation of Hubei Province (Grant No. 2022CFA096), and the Natural Science Foundation of Jiangxi Province (No. 20232BAB201046). The work of O. Prudnikov and V. Yudin was supported by the Russian Science Foundation (Grant No. 25-42-00093).

PY - 2026/3

Y1 - 2026/3

N2 - We propose a method for extracting the phase from atom interference fringes based on orthogonal subspace projection. By projecting the shear interference fringes from an atom interferometer into an orthogonal subspace, this method characterizes and removes the atomic ensemble envelope, thereby isolating the interference phase information. We systematically investigate the phase extraction accuracy of this method under various conditions, including different atomic ensemble envelope shapes and fringe contrasts, and apply it to analyze experimental data from two practical atom interferometers. The study demonstrates that, compared to the conventional direct model fitting method, our approach more accurately extracts the interference phase under conditions involving nonideal and dynamically varying atomic ensemble envelopes as well as low-contrast fringes, thereby improving the accuracy and robustness of the atom interferometer. This makes it particularly valuable for application-oriented atom shear interferometers operating in complex environments.

AB - We propose a method for extracting the phase from atom interference fringes based on orthogonal subspace projection. By projecting the shear interference fringes from an atom interferometer into an orthogonal subspace, this method characterizes and removes the atomic ensemble envelope, thereby isolating the interference phase information. We systematically investigate the phase extraction accuracy of this method under various conditions, including different atomic ensemble envelope shapes and fringe contrasts, and apply it to analyze experimental data from two practical atom interferometers. The study demonstrates that, compared to the conventional direct model fitting method, our approach more accurately extracts the interference phase under conditions involving nonideal and dynamically varying atomic ensemble envelopes as well as low-contrast fringes, thereby improving the accuracy and robustness of the atom interferometer. This makes it particularly valuable for application-oriented atom shear interferometers operating in complex environments.

UR - https://www.scopus.com/pages/publications/105031749005

UR - https://www.mendeley.com/catalogue/5f5a0e2c-33d4-35bf-88d7-e963e6f90e9f/

U2 - 10.1116/5.0312264

DO - 10.1116/5.0312264

M3 - Article

VL - 8

JO - AVS Quantum Science

JF - AVS Quantum Science

SN - 2639-0213

IS - 1

M1 - 015001

ER -