Charge Transfer Statistics in Quantum Point Contact

We present the results of the experimental study of the Charge Transfer Statistics for a Quantum Point Contact up to the third cumulant. QPC creates a variable transmission probability barrier, and therefore allows to check the CTS predictions [1] beyond the Poissonian limit. It has been recently understood that the intrinsic CTS is strongly affected by the measurement circuit, see [2] and references therein. We calculated the effect of the measurement circuit for a simple and realistic model of a capacitively shunted resistive load. We found the experimental results to be consistent with the calculations. We believe the results to be the first measurements of the third cumulant in a system different from the low transmission tunneling junction. \newline \newline [1] L.\,S. Levitov, G.\,B. Lesovik, JETP Lett. {\bf 58}, 230 (1993). \newline [2] B.~Reulet, J. Senzier and D. E. Prober, Phys. Rev. Let. {\bf 91}, 196601 (2003).