  The nonincreasing feature of temporal quantum steering under a completely
positive trace-preserving (CPTP) map, as proposed by Chen, et al. in Phys. Rev.
Lett. 116, 020503 (2016), has been considered as a practical measure of
non-Markovianity. In this paper, we utilize an all-optical scheme to simulate a
non-Markovian collision model and to examine how Gaussian steering can be used
as a tool for quantifying the non-Markovianity of a structured continuous
variable (CV) Gaussian channel. By modifying the reflectivity of the beam
splitters (BSs), we are able to tune the degree of non-Markovianity of the
channel. After analyzing the non-Markovian degree of the dissipative channel
within two steering scenarios, we discovered that the Gaussian steering-based
non-Markovian measure depends the specific scenario because of the asymmetry of
Gaussian steering. We also compared the Gaussian steering based
non-Markovianity to the one based on the violation of the divisibility of CPTP
map.
