Detection of non-Gaussian Fluctuations in a Quantum Point Contact

Abstract

An experimental study of current fluctuations through a tunable transmission barrier, a quantum point contact, are reported. We measure the probability distribution function of transmitted charge with precision sufficient to extract the first three cumulants. To obtain the intrinsic quantities, corresponding to voltage-biased barrier, we employ a procedure that accounts for the response of the external circuit and the amplifier. The third cumulant, obtained with a high precision, is found to agree with the prediction for the statistics of transport in the non-Poissonian regime.

4 pages, 4 figures; published version

References in corpus (3)

• Temperature dependent third cumulant of tunneling noise
• Wide-band detection of the third moment of shot noise by a hysteretic Josephson junction
• Distribution of voltage fluctuations in a current-biased conductor

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• Asymmetric noise probed with a Josephson junction
• Proposal for a cumulant-based Bell test for mesoscopic junctions
• Formulation of Time-Resolved Counting Statistics Based on a Positive-Operator-Valued Measure
• Conductance Anomaly and Fano Factor Reduction in Quantum Point Contacts
• Theory of quantum noise detectors based on resonant tunneling
• Achieving the threshold regime with an over-screened Josephson junction