The on-demand generation of single- and few-electron states in mesoscopic systems has opened the way to the fascinating field of electron quantum optics (EQO), where individual fermionic quantum states are manipulated with methods borrowed from photonic quantum-optical experiments. In this framework, a train of Lorentzian voltage pulses represents one of the most reliable experimental protocol to inject coherent single-electronic states, known as Levitons, into ballistic channels of meso-scale devices. These fascinating results open up the possibility of investigating the dynamics of single-electron states in one-dimensional systems, with potential applications for quantum electronics and quantum information. Indeed, it is well known that one dimensional electronic systems are drastically affected by electron-electron interaction. For instance, the latter can induce, in order to minimize Coulomb repulsion energy, the arrangement of electrons in a static regular pattern in space, a phenomenon known as Wigner crystallization. In this seminar, we propose fractional quantum Hall edge states, a seminal example of strongly interacting one-dimensional system, as a testbed to observe the crystallization of Leviton excitations in the time domain. To confirm the correlated character of this crystal state, we demonstrate that these features generate unexpected side dips in the noise profile of Hong-OuMandel collisional experiments, which are within reach for the nowadays technology.