# Quantum ammeter

## TL;DR

The paper introduces a theoretical model of a quantum ammeter capable of measuring the full counting statistics of electron currents at quantum time scales using a device with an Ohmic contact and a quantum dot.

## Contribution

It proposes a novel quantum ammeter design that enables access to current statistics at quantum time scales through a specific coupling and measurement scheme.

## Key findings

- The model predicts fractionalization of electrons at the Ohmic contact.
- Resonant tunneling current provides access to current moment generators.
- Device operates effectively at energies below the charging energy.

## Abstract

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 time scales. 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 an access to the moment generator of the current in one of the incoming channels at time scales comparable to its correlation time.