Electron counting with a two-particle emitter

TL;DR

This paper investigates a system of two driven quantum cavities connected via an edge state, analyzing their ability to emit, absorb, and count electrons and holes with high precision, and explores pulsed cavities for single-particle detection.

Contribution

It introduces a method to control and measure electron counting using two coupled driven cavities, highlighting conditions for nullifying current and effective particle counting.

Findings

The second cavity can nullify the current emitted by the first cavity.

Phase lag controls whether the system absorbs or emits particles.

Pulsed cavities enable single-particle detection.

Abstract

We consider two driven cavities (capacitors) connected in series via an edge state. The cavities are driven such that they emit an electron and a hole in each cycle. Depending on the phase lag the second cavity can effectively absorb the carriers emitted by the first cavity and nullify the total current or the set-up can be made to work as a two-particle emitter. We examine the precision with which the current can be nullified and with which the second cavity effectively counts the particles emitted by the first one. To achieve single-particle detection we examine pulsed cavities.