80 citations · 324 across the 9 of their papers we have counts for
8 papers · 1 filter
Coulomb collisions of hot and cold single electrons in series-coupled silicon single-electron pumps
Gento Yamahata, Nathan Johnson, Akira Fujiwara
Control of the Coulomb interaction between single electrons is vital for realizing quantum information processing using flying electrons and, particularly, for the realization of d…
Derivation of potential profile of a dynamic quantum dot
Nathan Johnson, Gento Yamahata, Akira Fujiwara
We report a method to derive the potential barrier profile shape in a dynamic quantum dot and show the loading statistics, and hence accuracy of electron transfer, depend significa…
Picosecond coherent electron motion in a silicon single-electron source
Gento Yamahata, Sungguen Ryu, Nathan Johnson +3
Understanding ultrafast coherent electron dynamics is necessary for application of a single-electron source to metrological standards, quantum information processing, including ele…
Continuous-Variable Tomography of Solitary Electrons
J. D. Fletcher, N. Johnson, E. Locane +7
A method for characterising the wave-function of freely-propagating particles would provide a useful tool for developing quantum-information technologies with single electronic exc…
Energy relaxation in hot electron quantum optics via acoustic and optical phonon emission
Clive Emary, Lewis A. Clark, Masaya Kataoka +1
We study theoretically the relaxation of hot quantum-Hall edge-channel electrons under the emission of both acoustic and optical phonons. Aiming to model recent experiments with si…
LO-phonon emission rate of hot electrons from an on-demand single-electron source in a GaAs/AlGaAs heterostructure
N. Johnson, C. Emary, S. Ryu +10
Using a recently-developed time-of-flight measurement technique with 1 ps time resolution and electron-energy spectroscopy, we developed a method to measure the longitudinal-optica…
Ultrafast Voltage Sampling using Single-Electron Wavepackets
N. Johnson, J. D. Fletcher, D. A. Humphreys +8
We demonstrate an ultrafast voltage sampling technique using a stream of electron wavepackets. Electrons are emitted from a single-electron pump and travel through electron wavegui…
Time-of-Flight Measurements of Single-Electron Wave Packets in Quantum-Hall Edge States
M. Kataoka, N. Johnson, C. Emary +7
We report time-of-flight measurements on electrons travelling in quantum-Hall edge states. Hot-electron wave packets are emitted one per cycle into edge states formed along a deple…