Squeezing Condensates

Daniel S. Rokhsar

Chih‐Sung Chuu, Florian Schreck, Todd P. Meyrath +3 more

We report the direct observation of number squeezing for a Bose-Einstein condensate confined in an optical trap. Squeezing of number fluctuations below the Poissonian limit is observed for condensates as small as 60 atoms.

Özgür Esat Müstecaplıoğlu, Mei Zhang, Li You

We analyze quantum correlation properties of a spinor-1 $(f=1)$ Bose-Einstein condensate using the Gell-Mann realization of SU(3) symmetry. We show that previously discussed phenomena of condensate fragmentation and spin mixing can be explained in terms of the hypercharge symmetry. The ground state of a spinor-1 condensate is found to be fragmented for ferromagnetic interactions. The notion of two-bosonic-mode squeezing is generalized to the two-spin $(U\ensuremath{-}V)$ squeezing within the SU(3) formalism. Spin squeezing in the isospin subspace (T) is found and is numerically investigated. We also provide results for the stationary states of spinor-1 condensates.

Ryan Balili, David W. Snoke

Yixiao Huang, Heng-Na Xiong, Zhe Sun +1 more

We propose a scheme to store the spin-nematic squeezing in a spinor Bose-Einstein condensate by applying periodic microwave pulses. For a proper pulse period and phase shift, the squeezing can be enhanced and maintained for a long time, which realizes the storage of the maximal squeezing. We also propose a method to generate the spin-nematic squeezed vacuum, which is associated with negligible occupation of the squeezed modes, through an adiabatic sweep of the magnetic field. It is shown that the method can be readily implemented for both ferromagnetic and antiferromagnetic condensates.