  We calculate the squeezed back-to-back correlation (BBC) functions of $\phi
\phi$ and $K^+K^-$ for heavy-ion collisions at RHIC and LHC energies, using
($2+1$)-dimensional hydrodynamics with fluctuating initial conditions. The BBC
functions averaged over event-by-event calculations for many events for the
hydrodynamic sources are smoothed as a function of the particle momentum. For
heavy-ion collisions of Au+Au at $\sqrt{s_{NN}}=200$ GeV, the BBC functions are
larger than those for collisions of Pb+Pb at $\sqrt{s_{NN}}=2.76$ TeV. The BBC
of $\phi\phi$ may possibly be observed in peripheral collisions at the RHIC and
LHC energies. It is large for the smaller sources of Cu+Cu collisions at
$\sqrt{s_{NN}}=200$ GeV.
