Quantum ammeter: Measuring full counting statistics of electron currents at quantum timescales

摘要

We present the theoretical model of the quantum ammeter, a device that is able to measure the full counting statistics of an electron current at quantum timescales. It consists of an Ohmic contact perfectly coupled to chiral quantum Hall channels and of a quantum dot attached to one of the outgoing channels. At energies small compared to its charging energy, the Ohmic contact fractionalizes each incoming electron and redistributes it between outgoing channels. By monitoring the resonant tunneling current through the quantum dot, one gets access to the moment generator of the current in one of the incoming channels at timescales comparable to its correlation time.