Journal
PHYSICAL REVIEW A
Volume 92, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.92.023603
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Funding
- Heidelberg Center for Quantum Dynamics
- European Comission [640800]
- Studienstiftung des deutschen Volkes
- Generalitat de Catalunya [2014SGR401]
- Ramon y Cajal program
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We demonstrate experimentally an alternative method for the dynamic generation of atomic spin squeezing, building on the interplay between linear coupling and nonlinear phase evolution. Since the resulting quantum dynamics can be seen as rotation and shear on the generalized Bloch sphere, we call this scheme twist-and-turn. This is closely connected to an underlying instability in the classical limit of this system. The short-time evolution of the quantum state is governed by a fast initial spreading of the quantum uncertainty in one direction, accompanied by squeezing in the orthogonal axis. We find an optimal value of xi(2)(S) = -7.1(3) dB in a single Bose-Einstein condensate and scalability of the squeezing to more than 10(4) particles with xi(2)(S) = -2.8(4) dB.
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