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The origin of quantum fluctuations responsible for the spin liquid state inTb$_2$Ti$_2$O$_7$ has remained a long standing problem. By synchrotron-basedterahertz measurements, we show evidence of strong coupling between themagnetic and lattice degrees of freedom that provides a path to the quantummelting process. As revealed by hybrid crystal electric field-phononexcitations that appear at 0.67 THz below 200 K, and around 0.42 THz below 50K, the double vibronic process is unique for Tb$^{3+}$ in the titanate familydue to adequate energy matching and strong quadrupolar moments. The resultssuggest that lattice motion can indeed be the driving force behind spin flipswithin the hybridized ground and first excited states, promoting quantum termsin the effective Hamiltonian that describes Tb$_2$Ti$_2$O$_7$.

Double Vibronic process in the quantum spin ice candidate Tb$_2$Ti$_2$O$_7$ revealed by terahertz spectroscopy