So we start off with a glass.
We first develop a way to save the observable quantum state of the subatomic particles that make up the glass. This effectively saves the quantum state that is the entire glass.
We then shatter the glass.
We collect up all the pieces and once we a majority of them we “re-observe” the pieces with the quantum state we previously saved.
By inducing an observation of the quantum state of the subatomic particles from the whole glass, the subatomic particles of the shattered glass resume their previous state and reform the glass as if it was never shattered. We may need to somehow “de-observe” the current state of the subatomic particles.
The next step would be to remove the need for the original subatomic particles at all.