  We study nonclassical effects in the dynamics of an open quantum system. The
model involves a harmonic oscillator coupled to a reservoir of non-interacting
harmonic oscillators. Different system-bath interaction schemes as well as
reservoir states are considered. Particularly, the squeezed reservoirs coupled
to the system through single and two quanta exchange processes are put in the
spotlight. We investigate the quantumness conveyed to the system through the
bath by computing a nonclassicality measure for different bath properties and
when the memory effects are appreciable. The measure of nonclassicality is
calculated for projective measurements both in the number state basis and a
basis formed by a set of coherent states. Our results show that in both bases
the measure exhibits characteristic features for each bath state and the form
of its interaction with the system. Some of those features are independent from
the measurement scheme (number or coherent), and thus, emergent from the bath
and its interaction with the probe system. This allows for fingerprinting and
identifying the environmental effects by tracking a given probe with
appropriate measurements. Hence, may prove useful for distinguishing different
sources of decoherence.
