# Quantum Phase Coherence in Mesoscopic Transport Devices with Two-Particle Interaction

## TL;DR

The paper introduces a new form of quantum phase coherence caused by two-particle interactions in electron transport devices.

## Contribution

A novel quantum phase coherence mechanism is identified through two-body interactions in mesoscopic transport.

## Key findings

- Two-body interaction generates quantum phase coherence in electron transport through quantum dots.
- Flux-dependent oscillations in zero-frequency cumulants reveal the effect of two-particle interactions.
- Accurately quantized peaks in the cumulant spectrum could be used to probe Coulomb interactions.

## Abstract

In this paper we demonstrate a new type of quantum phase coherence (QPC), which is generated by the two-body interaction. This conclusion is based on quantum master equation analysis for the full counting statistics of electron transport through two parallel quantum-dots with antiparallel magnetic fluxes in order to eliminate the Aharonov-Bohm interference of either single-particle or non-interacting two-particle wave functions. The interacting two-particle QPC is realized by the flux-dependent oscillation of the zero-frequency cumulants including the shot noise and skewness with a characteristic period. The accurately quantized peaks of cumulant spectrum may have technical applications to probe the two-body Coulomb interaction.