title: Quantum control of spin-nematic squeezing in a dipolar spin-1 condensate.
abstract: Versatile controllability of interactions and magnetic field in ultracold atomic gases ha now reached an era where spin mixing dynamics and spin-nematic squeezing can be studied. Recent experiments have realized spin-nematic squeezed vacuum and dynamic stabilization following a quench through a quantum phase transition. Here we propose a scheme for storage of maximal spin-nematic squeezing, with its squeezing angle maintained in a fixed direction, in a dipolar spin-1 condensate by applying a microwave pulse at a time that maximal squeezing occurs. The dynamic stabilization of the system is achieved by manipulating the external periodic microwave pulses. The stability diagram for the range of pulse periods and phase shifts that stabilize the dynamics is numerical simulated and agrees with a stability analysis. Moreover, the stability range coincides well with the spin-nematic vacuum squeezed region which indicates that the spin-nematic squeezed vacuum will never disappear as long as the spin dynamics are stabilized.
authors.affiliation: School of Science, Zhejiang University of Science and Technology, Hangzhou, Zhejiang, 310023, China.|College of Computer Science, Shaanxi Normal University, Xi'an 710062, China.
authors.forename: Yixiao
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China.
authors.forename: Heng-Na
authors.initials: HN
authors.lastname: Xiong
authors.affiliation: Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, School of Science, Jiangnan University, Wuxi 214122, China.
authors.forename: Zheng-Da
authors.initials: ZD
authors.lastname: Hu
authors.affiliation: College of Computer Science, Shaanxi Normal University, Xi'an 710062, China.
authors.forename: Zhengjun
authors.initials: Z
authors.lastname: Xi