The Design for a Nanoscale Single-Photon Spin Splitter

TL;DR

This paper proposes a novel nanoscale device that uses spin-orbit interaction in specially designed waveguides to efficiently separate photons based on their spin, enabling advanced quantum photonic applications.

Contribution

It introduces a new design leveraging spin-orbit interaction in Bragg-modulated cylindrical waveguides for spin-dependent photon separation.

Findings

Effective spin-dependent photon routing demonstrated

Spin-up and spin-down photons are directionally separated

Potential for integration in quantum photonic circuits

Abstract

We propose using the effective spin-orbit interaction of light in Bragg-modulated cylindrical waveguides for the effcient separation of spin-up and spin-down photons emitted by a single photon emitter. Due to the spin and directional dependence of photonic stopbands in the waveguides, spin-up (down) photon propagation in the negative (positive) direction along the waveguide axis is blocked while the same photon freely propagates in the opposite direction.