Heralded Generation of Macroscopic Superposition States in a Spinor Bose-Einstein Condensate

Year: 2019

Authors: Pezzè L., Gessner M., Feldmann P., Klempt C., Santos L., Smerzi A.

Autors Affiliation: CNR, INO, QSTAR, Largo Enrico Fermi 2, IT-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, IT-50125 Florence, Italy; PSL Univ, CNRS, Ecole Normale Super, Dept Phys, 24 Rue Lhomond, F-75005 Paris, France; Leibniz Univ Hannover, Inst Theoret Phys, Appelstr 2, DE-30167 Hannover, Germany; Leibniz Univ Hannover, Inst Quantenopt, Welfengarten 1, DE-30167 Hannover, Germany.

Abstract: Macroscopic superposition states enable fundamental tests of quantum mechanics and hold a huge potential in metrology, sensing, and other quantum technologies. We propose to generate macroscopic superposition states of a large number of atoms in the ground state of a spin-1 Bose-Einstein condensate. Measuring the number of particles in one mode prepares with large probability highly entangled macroscopic superposition states in the two remaining modes. The macroscopic superposition states are heralded by the measurement outcome. Our protocol is robust under realistic conditions in current experiments, including finite adiabaticity, particle loss, and measurement uncertainty.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 123 (26)      Pages from: 260403-1  to: 260403-7

More Information: We thank J. J. Kolodynski for comments on the manuscript. We thank Fabian Anders, Alexander Idel, Karsten Lange, and Jan Peise for useful discussions. We acknowledge support by the SFB 1227 DQ-mat (project B01) of the German Research Foundation (DFG). M. G. acknowledges funding by the Alexander von Humboldt foundation and the LabEx ENS-ICFP:ANR-10-LABX-0010/ANR-10-IDEX-0001-02 PSL*.
KeyWords: ENTANGLEMENT GENERATION; QUANTUM; DYNAMICS
DOI: 10.1103/PhysRevLett.123.260403

Citations: 14
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