laboratoire pierre aigrain
électronique et photonique quantiques
laboratoire pierre aigrain

Séminaire 10 Mai 2010

Mathias Albert<br class='autobr' />Departement de Physique Theorique, Universite de Geneve,<br class='autobr' />CH-1211 Geneve, Switzerland
Accuracy of the Quantum Capacitor as a Single Electron Source

Controllable single electron sources are at the forefront of current
research on nano-scale electronics. Systems that generate quantized
electrical currents, for example quantum capacitors and quantum pumps,
are of great interest due to their potential applications in metrology
and quantum information processing as well as in basic research on
single- and few-electron physics in mesoscopic structures.

Despite the experimental and theoretical advances, the accuracy at
which the quantum capacity emits electrons is still not well
understood. Here we consider a conceptually simple model of a quantum
capacitor and find analytically the noise spectrum as well as the full
distribution of emitted electrons (full counting statistics). We find
that the failure rate of the capacitor can be arbitrarily small when
operated under favorable conditions. Our predictions may be tested in
future experiments.