Patterns of noise—normally considered flaws—in images of an ultracold cloud of potassium provide the first-ever visual evidence of correlated ultracold atoms, a potentially useful tool for many applications, according to physicists at JILA, a joint institute of the National Institute of Standards and Technology (NIST) and the University of Colorado at Boulder.
Described in the March 21 online issue of Physical Review Letters, the noise analysis method could, in principle, be used to identify and test the limits of entanglement, a phenomenon Einstein called "spooky action at a distance."