Tailoring Single-Electron\nEmission Distributions in\nthe Time–Energy Phase Space

The\nprecise characterization and control of single-electron\nwave\nfunctions emitted from a single-electron source are essential for\nadvancing electron quantum optics. Here, we introduce a method for\ntailoring a single-electron emission distribution using energy filtering,\nenabling selective control of the distribution under various energy\nbarrier conditions of the filter. The tailored electron is studied\nby reconstructing its Wigner distribution in the time–energy\nphase space using the continuous-variable tomography method. Our results\nreveal that the filtering cuts the portion of the distribution below\nthe energy–barrier height of the filter in the time–energy\nspace. While the filtering is demonstrated in a classical regime of\nthe emitted electrons, we expect that this study significantly contributes\nto the design and implementation of advanced experiments toward quantum\ninformation processing based on single electrons.