Shot-noise detection in a carbon nanotube quantum dot

Phys Rev Lett. 2006 Jan 20;96(2):026803. doi: 10.1103/PhysRevLett.96.026803. Epub 2006 Jan 19.

Abstract

An on-chip detection scheme for high frequency signals is used to detect noise generated by a quantum dot formed in a single wall carbon nanotube. The noise detection is based on photon assisted tunneling in a superconductor-insulator-superconductor junction. Measurements of shot noise over a full Coulomb diamond are reported with excited states and inelastic cotunneling clearly resolved. Super-Poissonian noise is detected in the case of inelastic cotunneling.