  We demonstrate the transmission of single electron wavepackets from a
clock-controlled source through an empty high-energy edge channel. The quantum
dot source is loaded with single electrons which are then emitted with high
kinetic energy ($\sim$150 meV). We find at high magnetic field that these
electron can be transported over several microns without inelastic
electron-electron or electron-phonon scattering. Using a time-resolved
spectroscopic technique, we measure the electron energy and wavepacket size at
picosecond time scales. We also show how our technique can be used to switch
individual electrons into different paths.
