  Quantum correlations and entanglement in identical-particle systems have been
a puzzling question which has attracted vast interest and widely different
approaches. A novel approach is introduced by Kraus \emph{et al.}, [Phys. Rev.
A \textbf{79}, 012306 (2009)] based on pairing correlations in fermionic
systems and the use of witness formalism to detect pairing. In this
contribution, this approach has been extended to bosonic systems and
separability bounds based on pairing correlations for fermions and bosons have
been obtained. A two-particle annihilation operator is used for constructing a
two-particle observable as a candidate witness. Two different types of
separability definition is introduced for bosonic systems and the separability
bounds associated with each type are discussed.
