6533b830fe1ef96bd1297329

RESEARCH PRODUCT

Time-energy filtering of single electrons in ballistic waveguides

Elina LocanePiet W. BrouwerVyacheslavs Kashcheyevs

subject

PhysicsQuantum opticsCondensed Matter - Mesoscale and Nanoscale PhysicsWigner quasiprobability distributionWave packet500 Naturwissenschaften und Mathematik::530 Physik::530 PhysikGeneral Physics and AstronomyFOS: Physical sciencesElectronQuantum tomographyQuantum Hall effect01 natural sciences530010305 fluids & plasmasComputational physicsquantum state tomography0103 physical sciencesMesoscale and Nanoscale Physics (cond-mat.mes-hall)time-dependent scatteringQuantum metrologyWigner distribution functionelectron quantum optics010306 general physicssingle-electron devices

description

Characterizing distinct electron wave packets is a basic task for solid-state electron quantum optics with applications in quantum metrology and sensing. A important circuit element for this task is a non-stationary potential barrier than enables backscattering of chiral particles depending on their energy and time of arrival. Here we solve the quantum mechanical problem of single-particle scattering by a ballistic constriction in an fully depleted quantum Hall system under spatially uniform but time-dependent electrostatic potential modulation. The result describes electrons distributed in time-energy space according to a modified Wigner quasiprobability distribution and scattered with an energy-dependent transmission probability that characterizes constriction in the absence of modulation. Modification of the incoming Wigner distribution due to external time-dependent potential simplifies in case of linear time-dependence and admits semiclassical interpretation. Our results support a recently proposed and implemented method for measuring time and energy distribution of solitary electrons as a quantum tomography technique, and offer new paths for experimental exploration of on-demand sources of coherent electrons.

yearjournalcountryeditionlanguage
2019-01-01
10.1088/1367-2630/ab3fbbhttp://arxiv.org/abs/1901.08940