  The multiplicity distribution and the two-particle Bose-Einstein correlations
at fixed multiplicities observed in $pp$ collisions at $\sqrt{s}=7$ TeV by the
ALICE Collaboration are analyzed by the formulae obtained in the quantum
optical approach. The chaoticity parameters in the inclusive and semi-inclusive
events are estimated from the analysis.
  Multiplicity or $k_T$ dependence of longitudinal and transverse source radii
are also estimated.
