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