Persistent and enhanced spin-nematic squeezing in a spinor Bose–Einstein condensate. (21st January 2022)

• Record Type: Journal Article
• Authors: Li, Xinfang; Liu, Jianning; Seth, Osei; Xiong, Heng-Na; Tan, Qing-Shou; Huang, Yixiao
• Is Part Of: Communications in theoretical physics. Volume 74:Number 2(2022)
• Publication Date: 2022-01-21
• Subjects: quantum metrology -- heisenberg limit -- interferometry; Physics -- Periodicals; 530.105
• DOI: 10.1088/1572-9494/ac450e
• Languages: English
• ISSNs: 0253-6102

Abstract

Abstract: We propose a simple scheme to realize the persistent spin-nematic squeezing in a spinor Bose–Einstein condensate by rapidly turning-off the external magnetic field at a time that maximal spin-nematic squeezing occurs. We observe that the optimal spin-nematic squeezing can be maintained in a nearly fixed direction. For a proper initial magnetic field, the optimal squeezing can be obviously enhanced. We further construct a spin-mixing interferometer, where the quantum correlation of the squeezed state (generated by our scheme) is fully utilized in the phase measurement, and show the phase sensitivity of the interferometer has a significant enhancement.