Hanbury Brown and Twiss correlations across the Bose-Einstein condensation threshold

Abstract

Hanbury Brown and Twiss (HBT) correlations, i.e. correlations in far-field intensity fluctuations, yield fundamental information on the quantum statistics of light sources, as highlighted after the discovery of photon bunching. Drawing on the analogy between photons and atoms, similar measurements have been performed for matter-wave sources, probing density fluctuations of expanding ultracold Bose gases. Here we use two-point density correlations to study how coherence is gradually established when crossing the Bose-Einstein condensation (BEC) threshold. Our experiments reveal a persistent multimode character of the emerging matter-wave as seen in the non-trivial spatial shape of the correlation functions for all probed source geometries from nearly isotropic to quasi-one-dimensional (quasi-1D), and for all probed temperatures. The qualitative features of our observations are captured by ideal Bose gas theory, the quantitative differences illustrate the role of particle interactions.

References in corpus (8)

• Thermalization and its mechanism for generic isolated quantum systems
• Spatial quantum noise interferometry in expanding ultracold atom clouds
• Camparison of the Hanbury Brown-Twiss effect for bosons and fermions
• Critical Behavior of a Trapped Interacting Bose Gas
• Breakdown of integrability in a quasi-one-dimensional ultracold bosonic gas
• Quasi-1D Bose-Einstein condensates in the dimensional crossover regime
• Multi-layer atom chips for versatile atom micro manipulation
• Density ripples in expanding low-dimensional gases as a probe of correlations

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