Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.033401
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Funding
- European Research Council (Synergy Grant UQUAM)
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Using parametric conversion induced by a Shapiro-type resonance, we produce and characterize a two-mode squeezed vacuum state in a sodium spin 1 Bose-Einstein condensate. Spin-changing collisions generate correlated pairs of atoms in the m = +/--1 Zeeman states out of a condensate with initially all atoms in m = 0. A novel fluorescence imaging technique with sensitivity Delta N similar to 1.6 atom enables us to demonstrate the role of quantum fluctuations in the initial dynamics and to characterize the full distribution of the final state. Assuming that all atoms share the same spatial wave function, we infer a squeezing parameter of 15.3 dB.
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