Density-density correlation and interference mechanism for two initially independent Bose-Einstein condensates

Abstract

In an exciting experiment by MIT's group (Science 275, 637 (1997)), clear interference fringes were observed for two initially independent Bose condensates in dilute gas. Presently, there are two different theories (measurement-induced interference theory and interaction-induced interference theory) which can both explain MIT's experimental results. Based on our interaction-induced interference theory, we consider the evolution of the density-density correlation after the releasing of a double-well potential trapping two independent Bose condensates. Based on the interaction-induced interference theory, we find that the interference fringes in the density-density correlation exhibit a behavior of emergence and disappearance with the development of time. We find essential difference for the density-density correlation based on interaction-induced interference theory and measurement-induced interference theory, and thus we suggest the density-density correlation to experimentally reveal further the interference mechanism for two initially independent Bose condensates.

See also cond-mat/0612132 (or New Journal of Physics 8, 245 (2006))

References in corpus (12)

• Spatial quantum noise interferometry in expanding ultracold atom clouds
• Camparison of the Hanbury Brown-Twiss effect for bosons and fermions
• Extension of Bogoliubov theory to quasi-condensates
• Fragmentation of Bose-Einstein Condensates
• Dynamical density-density correlations in the one-dimensional Bose gas
• Pair correlations of an expanding superfluid Fermi gas
• Interferences in the density of two Bose-Einstein condensates consisting of identical or different atoms
• Spatial Correlation Functions of one-dimensional Bose gases at Equilibrium
• Interaction-induced interference for two independent Bose-Einstein condensates
• Time-dependent quantum many-body theory of identical bosons in a double well: Early time ballistic interferences of fragmented and number entangled states
• Josephson effect and quantum merging of two Bose superfluids
• Adiabatic and non-adiabatic merging of independent Bose condensates

Cited by in corpus (2)

• Phase coherence and fragmentation in weakly interacting bosonic gases
• Build-up of coherence between initially-independent subsystems: The case of Bose-Einstein condensates