2020/04/30 by An Qu, Bertrand Evrard, Jean Dalibard +1 · 1 citation
Computer Science · Physics and Astronomy · #Atom (system on chip) #Atomic physics #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Magnetic field #Physics #Quantum Information and Cryptography #Quantum mechanics #Quantum optics and atomic interactions #Spin (aerodynamics) #Spin states #Zeeman effect #cond-mat.quant-gas #quant-ph
paper · pdf · doi:10.1103/physrevlett.125.033401
published as Phys. Rev. Lett. 125, 033401 (2020) · Supplementary material available as ancillary file
arxiv created 2020/07/11 · openalex publication_date 2020/07/17 · arxiv updated 2020/07/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 ΔN∼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.