1. Critically enhanced spin-nematic squeezing and entanglement in dipolar spinor condensates
- Author
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Qing-Shou Tan, Xiaoguang Wang, Yixiao Huang, and Qiongtao Xie
- Subjects
Condensed Matter::Quantum Gases ,Physics ,Quantum phase transition ,Quantum Physics ,Spinor ,Vacuum state ,FOS: Physical sciences ,Quantum entanglement ,01 natural sciences ,010305 fluids & plasmas ,Dipole ,Critical point (thermodynamics) ,Liquid crystal ,Quantum mechanics ,0103 physical sciences ,Quantum Physics (quant-ph) ,010306 general physics ,Quantum - Abstract
We study the quantum critical effect enhanced spin-nematic squeezing and quantum Fisher information (QFI) in the spin-1 dipolar atomic Bose-Einstein condensate. We show that the quantum phase transitions can improve the squeezing and QFI in the nearby regime of critical point, and the Heisenberg-limited high-precision metrology can be obtained. The different properties of the ground squeezing and entanglement under even and odd number of atoms are further analyzed, by calculating the exact analytical expressions.We also demonstrate the squeezing and entanglement generated by the spin-mixing dynamics around the phase transition point. It is shown that the steady squeezing and entanglement can be obtained, and the Bogoliubov approximation can well describe the dynamics of spin-nematic squeezed vacuum state., Comment: 8 pages, 6 figures, accepted for publication in PRA
- Published
- 2020