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10 records were found.
Comment: 4 pages, 4 figures
Comment: 3 pages, 4 figures
Comment: 6 pages, 6 figures
We report on shot noise measurements in carbon nanotube based Fabry-Perot
electronic interferometers. As a consequence of quantum interferences, the
noise power spectral density oscillates as a function of the voltage applied to
the gate electrode. The quantum shot noise theory accounts for the data
quantitatively. It allows to confirm the existence of two nearly degenerate
orbitals. At resonance, the transmission of the nanotube approaches unity, and
the nanotube becomes noiseless, as observed in quantum point contacts. In this
weak backscattering regime, the dependence of the noise on the backscattering
current is found weaker than expected, pointing either to electron-electron
interactions or to weak decoherence.
Comment: 8 pages - minor differences with published version
In analogy with quantum optics, short time correlations of the current
fluctuations are used to characterize an on-demand electron source consisting
of a quantum dot connected to a conductor via a tunable tunnel barrier. We
observe a new fundamental noise for electrons associated with the quantum
fluctuations of the electron emission time, which we call quantum jitter. In
optimum operating conditions of the source, the noise reduces to the quantum
jitter limit, which demonstrates single particle emission. Combined with the
coherent manipulations of single electrons in a quantum conductor, this
electron quantum optics experiment opens the way to explore new problems
including quantum statistics and interactions at the single electron level.
Comment: 17 pages, 15 figures
Comment: 5 pages, 4 figures
Comment: minor differences with published version
