title: Ultrafast Emission and Detection of a Single-Electron Gaussian Wave Packet: A Theoretical Study.
abstract: Generating and detecting a prescribed single-electron state is an important step towards solid-state fermion optics. We propose how to generate an electron in a Gaussian state, using a quantum-dot pump with gigahertz operation and realistic parameters. With the help of a strong magnetic field, the electron occupies a coherent state in the pump, insensitive to the details of nonadiabatic evolution. The state changes during the emission from the pump, governed by competition between the Landauer-Buttiker traversal time and the passage time. When the former is much shorter than the latter, the emitted state is a Gaussian wave packet. The Gaussian packet can be identified by using a dynamical potential barrier, with a resolution reaching the Heisenberg minimal uncertainty ℏ/2.
authors.affiliation: Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
authors.forename: Sungguen
authors.initials: S
authors.lastname: Ryu
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Kataoka
authors.affiliation: Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
authors.forename: H-S
authors.initials: HS
authors.lastname: Sim