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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 BBCfunctions averaged over event-by-event calculations for many events for thehydrodynamic sources are smoothed as a function of the particle momentum. Forheavy-ion collisions of Au+Au at $\sqrt{s_{NN}}=200$ GeV, the BBC functions arelarger than those for collisions of Pb+Pb at $\sqrt{s_{NN}}=2.76$ TeV. The BBCof $\phi\phi$ may possibly be observed in peripheral collisions at the RHIC andLHC energies. It is large for the smaller sources of Cu+Cu collisions at$\sqrt{s_{NN}}=200$ GeV.

Predictions for squeezed back-to-back correlations of $\phi\phi$ and $K^+K^-$ in high-energy heavy-ion collisions by event-by-event hydrodynamics