VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Tuesday 6
Quantum electronics, quantum information, electronic quantum optics, high frequency noise

› 14:00 - 14:30 (30min)
Coherence and indistinguishability of single electrons emitted by independent sources
Ewann Bocquillon  1@  , Vincent Freulon  1@  , Jean-Marc Berroir  1@  , Pascal Degiovanni  2@  , Bernard Plaçais  1@  , Antonella Cavanna  3@  , Yong Jin  3@  , Gwendal Feve  1@  
1 : Laboratoire Pierre Aigrain  (LPA)  -  Website
CNRS : UMR8551, Université Pierre et Marie Curie - Paris VI, Université Paris Diderot - Paris 7, Ecole Normale Supérieure de Paris - ENS Paris
Département de Physique Ecole Normale Supérieure 24, rue Lhomond F-75231 Paris Cedex 05 -  France
2 : Laboratoire de Physique de l'ENS Lyon  (Phys-ENS)  -  Website
CNRS : UMR5672, Ecole Normale Supérieure de Lyon
46 allée d'Italie 69007 Lyon -  France
3 : Laboratoire de photonique et de nanostructures  (LPN)
CNRS : UPR20
Route de Nozay 91460 MARCOUSSIS -  France

The ballistic propagation of electronic waves in the quantum Hall edge channels of a 2DEG bears strong analogies with photon optics. These analogies have inspired a whole set of experiments, where single electronic excitations are manipulated in optics like setups. Using two independent on-demand electron sources [1], we have realized the electronic analog [2,3] of the optical Hong-Ou-Mandel [4] experiment. The emission of two single-electron wavepackets is triggered at different inputs of an electronic beamsplitter. Whereas classical particles would be randomly partitioned, we observe two-particle interferences resulting rom quantum exchange. Both electrons, emitted in indistinguishable wavepackets with synchronized arrival time on the splitter, exit in different outputs as recorded by the low frequency current noise. Full random partitioning is recovered when the arrival of one electron is delayed with respect to the other. This two-electron interference experiment demonstrates the possibility to generate on-demand coherent and indistinguishable single-electron wavepackets in quantum conductors.

 [1] G. Fève et al., Science 316, 1169 (2007).

 [2] Ol'khovskaya et al., PRL 101, 166802 (2008).

 [3] T. Jonckheere et al., PRB 86, 125425 (2012)

[4] C. K. Hong et al., PRL 59, 2044 (1987).


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