Fast and optimal generation of entanglement in bosonic Josephson junctions

Year: 2019

Authors: Sorelli G., Gessner M., Smerzi A., Pezzè L.

Autors Affiliation: CNR, INO, QSTAR, Largo Enrico Fermi 2, I-50125 Florence, Italy; LENS, Largo Enrico Fermi 2, I-50125 Florence, Italy; Albert Ludwigs Univ Freiburg, Phys Inst, Hermann Herder Str 3, D-79104 Freiburg, Germany; PSL Univ, CNRS, Ecole Normale Super, Dept Phys, 24 Rue Lhomond, F-75005 Paris, France

Abstract: We use an exact quantum phase model to study the dynamical generation of particle entanglement in a bosonic Josephson junction composed by two coupled and interacting Bose-Einstein condensates. Using analytical arguments, we show that linear coupling can accelerate the creation of entanglement with respect to the well-known one-axis twisting model where coupling is absent. Furthermore, with a numerical analysis of optimal control schemes, we identify the optimal parameters for the fast generation of metrologically useful entanglement on short timescales: the optimal evolution is generated for a specific ratio between the coupling and the interaction strength.

Journal/Review: PHYSICAL REVIEW A

Volume: 99 (2)      Pages from: 022329-1  to: 022329-11

More Information: M.G. acknowledges funding by the Alexander von Humboldt foundation. This work has been supported by the QuantERA ERA-NET Cofund in Quantum Technologies project “Q-Clocks”, by the EURAMET Empir project “USOQS” and by the LabEx ENS-ICFP: ANR-10-LABX-0010/ANR-10-IDEX-0001-02 PSL*.
KeyWords: BOSE-EINSTEIN CONDENSATE; STATES
DOI: 10.1103/PhysRevA.99.022329

Citations: 19
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