Ultrashort Electron Wave Packets via Frequency-Comb Synthesis

Single-electron sources are vital for modern nanoelectronics, enabling advances in the emerging field of electron quantum optics. However, their performance is limited by current method generating single electrons applying Lorentzian voltage pulses on Fermi sea a conductor. The authors introduce Fourier synthesis-based pulse generator, allowing generation and in-situ characterization 27-ps wave packet an electronic Mach-Zehnder interferometer. This advancement can potentially enable study ultrafast dynamics nanoelectronic systems high-frequency flying-electron qubits.