Nonreciprocal photon transport in indirectly coupled whispering-gallery mode resonators

TL;DR

This paper investigates how two coupled whispering-gallery mode resonators with embedded quantum dots can be tuned to achieve unidirectional light reflection and transmission, advancing quantum optical device design.

Contribution

It demonstrates control over nonreciprocal photon transport using coupled resonators with quantum dots, offering new insights for quantum optical device development.

Findings

Unidirectional reflection and transmission achieved by tuning coupling strength.

Resonance frequencies correspond to low reflection or transmission peaks.

Provides a method for designing quantum optical isolators and circulators.

Abstract

We study the reflection and transmission properties of a system comprising two whispering-gallery mode resonators, each containing a Zeeman-split quantum dot and side-coupled to an optical fiber. Our results demonstrate that unidirectional reflection and transmission can be achieved by tuning the coupling strength between the resonators and the optical fiber. Furthermore, we establish a correspondence between quantum dot energy level resonance frequencies and the positions of low reflection (transmission) peaks at a phase shift of {\pi}. This research provides insights for the development of quantum optical devices like isolators, circulators, and routers.