Measurement theory and interference of spinor BoseEinstein condensates
Abstract
We study two aspects of measurement theory in spinor BoseEinstein condensates of F=1 atoms: the probability of obtaining a certain outcome of the measurement and the evolution of the state of the condensate due to the measurement. We also study the interference patterns arising from the spatial overlap of two spinor condensates. We show that neither a measurement on a small number of escaping atoms nor an interference experiment can distinguish between an antiferromagnetic coherent state condensate, i.e., a condensate in which all the atoms have S_{z}=0 along an a priori unknown direction, and a spinsinglet condensate, i.e., a condensate with S_{total}=0. We also show that a singletstate condensate evolves into a coherent state as a result of the measurement.
 Publication:

Physical Review A
 Pub Date:
 February 2002
 DOI:
 10.1103/PhysRevA.65.023604
 Bibcode:
 2002PhRvA..65b3604A
 Keywords:

 03.75.Fi;
 05.30.Jp;
 Boson systems