Spin-Nematic Squeezing In A Spinor Bose-Einstein Condensate

The coherence of atoms in Bose-Einstein condensates is similar to that of laser,which can provide a good coherent atomic wave source for high-precision interferometer.There is a nonlinear interaction between atoms in Bose-Einstein condensates,which can be utilized to generate spin squeezed states.The spincompression has its own significant advantages,such as spin-compression parameters are easy to measure experimentally,and it has broad application prospects in improving measurement accuracy.In addition to applications in the field of quantum information,it is also widely used in spectroscopy research.Previous work mainly focused on the squeezed state itself,if applied to improve the measurement accuracy of precision equipment(atomic clock,interferometer,etc.)need to maintain or even enhance the compression.Therefore,the research on spin nematic squeezing in spinor Einstein condensates is of great significance for accelerating the development of quantum science and technology and promoting scientific progress.This paper proposes a simple scheme to store and improve the spin-nematic squeezing in spinor Bose-Einstein condensate under an external magnetic field.At the same time,an interferometer with spin condensate is also proposed,and it is proved that the phase sensitivity can be enhanced by using this scheme,thus improving spinnematic compression.We hope to provide a theoretical basis for the experiment of atomic ultra-high sensitivity magnetic field spin hybrid interference technology in the future.