  We report on a preliminary study of static quark anti-quark potential at
non-zero temperature in $2+1$ flavor QCD using $96^3\times N_{\tau}$ lattices
with lattice spacing $a=0.028$fm, physical strange quark mass and light quark
masses corresponding to pion mass of about $300$ MeV. We use
$N_\tau=32,~24,~20$ and $16$ that correspond to temperature range $T=220-441$
MeV. The in order to obtain the potential we calculate the Wilson line
correlator in Coulomb gauge with additional HYP smearing to reduce the noise at
large quark anti-quark separations. We apply $0$, $5$ and $10$ steps of HYP
smearing to ensure that there is no physical effect from over-smearing. At the
two highest temperatures we also consider a noise reduction technique that is
based on an interpolation in the spatial separation between the static quark
and anti-quark.
