Incoherence of Bose-Einstein condensates at supersonic speeds due to quantum noise

Abstract

We calculate the effect of quantum noise in supersonic transport of Bose-Einstein condensates. When an obstacle obstructs the flow of atoms, quantum fluctuations cause atoms to be scattered incoherently into random directions. This suppresses the propagation of Cherenkov radiation, creating quantum turbulence and a crescent of incoherent atoms around the obstacle. We observe similar dynamics if the BEC is stirred by a laser beam: crescents of incoherent atoms are emitted from the laser's turning-points. Finally, we investigate supersonic flow through a disordered potential, and find that the quantum fluctuations generate an accumulation of incoherent atoms as the condensate enters the disorder.

6 pages, 5 figures

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Cited by in corpus (4)

• Pattern formation of quantum Kelvin-Helmholtz instability in binary superfluids
• Inelastic Multiple Scattering of Interacting Bosons in Weak Random Potentials
• Ultracold bosonic scattering dynamics off a repulsive barrier: coherence loss at the dimensional crossover
• Inversion of coherent backscattering with interacting Bose-Einstein condensates in two-dimensional disorder : a Truncated Wigner approach