  Double Chooz experiment will search for a disappearance of the reactor
neutrinos from Chooz reactor cores in Ardenne, France, in order to detect the
yet unknown neutrino oscillation angle \theta 13. The far detector was
completed in 2010 and data-taking has started in spring 2011. Status of
data-taking is presented and some performance plots from physics data are shown
in this paper for the first time. Also the prospect of experimental sensitivity
is presented, in light of recent indication from T2K for a non-zero \theta 13
value.
