Spin-squeezing state of atomic ensembles and its application prospect in atomic clocks

YANG Hong-ping

(College of Physics and Electronic Information, Shanxi Normal University, Linfen 041004, China)

Abstract: Spin squeezing is a promising approach to overcoming the Standard Quantum Limit set by the projection noise of independent atomic ensembles. This paper briefly presents the basic concept and properties of spin squeezing, and introduces an experimental scheme of producing spin squeezing of ⁸⁷Rb ensemble using an optical resonator, as well as discusses the decoherence mechanisms encountered in the implementation of spin squeezing both theoretically and technically. Finally, the application prospects of spin squeezing in atomic clock and the related problems needed to be overcome are summarized.