Special group Seminar via Zoom: Squeezed Ground States in a Spin-1 Bose-Einstein Condensate

December 20, 2021

Xin Lin, Georgia Institute of Technology
Group Seminar via video conference (Zoom)
Monday, December 20, 2:00 pm (MEZ)

Due to the Covid-19 pandemic, we are still holding our group seminars and journal clubs via video conference.This procedure enables us to continue our research, enhance discussions and exchange important information.


We find a fast non-adiabatic protocol for the creation of spin squeezed ground states in a spin-1 Bose condensate and experimentally generate those states near the quantum critical point between the polar and ferromagnetic quantum phases of the interacting spin ensemble. The method consists of a pair of controlled quenches of an external magnetic field, which has the same leading order dependence for the total time as the quantum optimal control method but is simpler and realizable. In contrast to typical non-equilibrium methods for preparing atomic squeezed states by quenching through a quantum phase transition, squeezed ground states are time-stationary and remain squeezed for the lifetime of the condensate. A squeezed ground state with a metrological improvement up to 6-8 dB and a constant squeezing angle maintained over 2s is demonstrated.

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