An atomtronic flux qubit: A ring lattice of Bose-Einstein condensates interrupted by three weak links

D. Aghamalyan (1, 2) , N.T. Nguyen (2) , F. Auksztol (2) , K.S. Gan (2) , M.M. Valado (2) , P.C. Condylis (2) , L.-C. Kwek (2) , R. Dumke (2) , L. Amico (2)

1 IPR - Institut de Physique de Rennes
2 NUS - National University of Singapore

We study a physical system consisting of a Bose-Einstein condensate confined to a ring shaped lattice potential interrupted by three weak links. The system is assumed to be driven by an effective flux piercing the ring lattice. By employing path integral techniques, we explore the effective quantum dynamics of the system in a pure quantum phase dynamics regime. Moreover, the effects of the density's quantum fluctuations are studied through exact diagonalization analysis of the spectroscopy of the Bose-Hubbard model. We demonstrate that a clear two-level system emerges by tuning the magnetic flux at degeneracy. The lattice confinement, platform for the condensate, is realized experimentally employing a spatial light modulator. © 2016 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Keywords: Bose-Einstein condensation; Hubbard model; Light modulators; Quantum computers; Quantum electronics; Quantum interference devices; Statistical mechanics; Bose Hubbard model; Bose-Einstein condensates; Exact diagonalization; Flux qubits; Lattice potentials; Physical systems; Quantum fluctuation; Spatial light modulators; Quantum theory

Domains: Physics [physics]

D. Aghamalyan, N.T. Nguyen, F. Auksztol, K.S. Gan, M.M. Valado, et al.. An atomtronic flux qubit: A ring lattice of Bose-Einstein condensates interrupted by three weak links. New Journal of Physics, 2016, 18 (7), pp.075013. ⟨10.1088/1367-2630/18/7/075013⟩. ⟨hal-01372797⟩