Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Focus Session: Single Particle Sources for Electronic Devices I
(Joint session of HL and TT organized by HL)
TT 10.4: Hauptvortrag
Montag, 7. März 2016, 12:30–13:00, H10
(De)coherence of single electron wavepackets in quantum Hall edge channels — •Erwann Bocquillon1,2, Arthur Marguerite2, Vincent Freulon2, Jean-Marc Berroir2, Bernard Plaçais2, Antonella Cavanna3, Yong Jin3, and Gwendal Fève2 — 1Physikalisches Institut (EP3), Universität Würzburg, Würzburg, Germany — 2Laboratoire Pierre Aigrain, Ecole Normale Supérieure, Paris, France — 3Laboratoire de Photonique et Nanostructures, Marcoussis, France
The ballistic propagation of electronic waves along the quantum Hall edge channels of a two dimensional electron gas bears strong analogies with photon optics. Ballistic and one-dimensional propagation are provided by the chiral quantum Hall edge states and electronic beam splitters can be implemented using quantum point contacts. These analogies have inspired a whole set of experiments and provide an efficient tool to understand electronic propagation in quantum conductors.
In this talk, I will present how one can implement electron quantum optics experiments down to a single charge resolution using an on-demand single electron emitter. In particular, we generate two indistinguishable quasiparticles that we characterize via their interference on a beamsplitter in an electronic analogue of the Hong-Ou-Mandel experiment. The visibility of two-particle interferences reveals decoherence effects due to interactions with the environment, and especially with other co-propagating edge channels. These implementations of electron quantum optics experiments pave the way to more complex ones, such as the tomography of a single electron.