An On-Demand Coherent Single-Electron Source

Author:

Fève G.123,Mahé A.123,Berroir J.-M.123,Kontos T.123,Plaçais B.123,Glattli D. C.123,Cavanna A.123,Etienne B.123,Jin Y.123

Affiliation:

1. Laboratoire Pierre Aigrain, Département de Physique de l'Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France.

2. Service de Physique de l'Etat Condensé, CEA Saclay, F-91191 Gif-sur-Yvette, France.

3. Laboratoire de Photonique et Nanostructures, UPR20 CNRS, Route de Nozay, 91460 Marcoussis Cedex, France.

Abstract

We report on the electron analog of the single-photon gun. On-demand single-electron injection in a quantum conductor was obtained using a quantum dot connected to the conductor via a tunnel barrier. Electron emission was triggered by the application of a potential step that compensated for the dot-charging energy. Depending on the barrier transparency, the quantum emission time ranged from 0.1 to 10 nanoseconds. The single-electron source should prove useful for the use of quantum bits in ballistic conductors. Additionally, periodic sequences of single-electron emission and absorption generate a quantized alternating current.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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