Quantum Depletion of a Homogeneous Bose-Einstein Condensate

Raphael Lopes (1) , Christoph Eigen (1) , Nir Navon (1) , David Clément (2) , Robert P. Smith (1) , Zoran Hadzibabic (1)

1 Cavendish Laboratory
2 Laboratoire Charles Fabry / Optique atomique

We have measured the quantum depletion of an interacting homogeneous Bose-Einstein condensate, and confirmed the 70-year old theory of N.N. Bogoliubov. The observed condensate depletion is reversibly tuneable by changing the strength of the interparticle interactions. Our atomic homogeneous condensate is produced in an optical-box trap, the interactions are tuned via a magnetic Feshbach resonance, and the condensed fraction probed by coherent two-photon Bragg scattering.

Domaines: Matière Molle [cond-mat.soft]; Physique Atomique [physics.atom-ph]; Physique Quantique [quant-ph]

Raphael Lopes, Christoph Eigen, Nir Navon, David Clément, Robert P. Smith, et al.. Quantum Depletion of a Homogeneous Bose-Einstein Condensate. Physical Review Letters, 2017, 119 (19), ⟨10.1103/PhysRevLett.119.190404⟩. ⟨hal-01637897⟩