Path-dependent initialization of a single quantum dot exciton spin in a nano-photonic waveguide

TL;DR

This paper presents a robust in-plane spin initialization and readout method for a single quantum dot in a nanophotonic waveguide, achieving high fidelity and independence from laser polarization, advancing quantum information processing.

Contribution

It introduces a novel in-plane excitation scheme leveraging chiral coupling for high-fidelity spin control in quantum dots within nanophotonic structures.

Findings

Spin initialization and readout fidelity approaches unity at 1 T magnetic field.

The excitation scheme is polarization-independent and relies on excitation direction.

Provides a robust basis for photon-mediated quantum spin networks.

Abstract

We demonstrate a scheme for in-plane initialization and readout of a single exciton spin in an InGaAs quantum dot (QD) coupled to a GaAs nanobeam waveguide. The chiral coupling of the QD and the optical mode of the nanobeam enables spin initialization and readout fidelity approaching unity in magnetic field $B=1$ T and $\sim$0.9 without the field. We further show that this in-plane excitation scheme is independent of the incident excitation laser polarization and depends solely on the excitation direction. This scheme provides a robust in-plane spin excitation basis for a photon-mediated spin network for quantum information applications.