Accessing the degree of Majorana nonlocality in a quantum dot-optical microcavity system

TL;DR

This paper investigates how light-matter interactions in a quantum dot-microcavity system can be used to measure the nonlocality of Majorana zero modes in a nanowire, providing a new optical method for probing topological quantum states.

Contribution

It introduces a novel approach to assess the degree of Majorana nonlocality using optical spectroscopy in a quantum dot-microcavity setup, linking light-matter coupling to topological properties.

Findings

Strong light-matter coupling distinguishes different Majorana nonlocality regimes.

Photon-induced transitions can tune the quantum dot spectrum.

The method enables access to the topological quality factor of Majorana modes.

Abstract

We explore the tunneling transport properties of a quantum dot embedded in an optical microcavity and coupled to a semiconductor-superconductor one-dimensional nanowire (Majorana nanowire) hosting Majorana zero modes (MZMs) at their edges. Conductance profiles reveal that strong light-matter coupling can be employed to distinguish between the cases of highly nonlocal MZMs, overlapped MZMs and MZMs with less degree of nonlocal feature. Moreover, we show that it is possible to access the degree of Majorana nonlocality (topological quality factor) by changing the dot spectrum through photon-induced transitions tuned by an external pump applied to the microcavity.