Engineering strong chiral light-matter interactions in a waveguide-coupled nanocavity

Abstract

Spin-dependent, directional light-matter interactions form the basis of chiral quantum networks. In the solid state, quantum emitters commonly possess circularly polarised optical transitions with spin-dependent handedness. We demonstrate numerically that spin-dependent chiral coupling can be realised by embedding such an emitter in a waveguide-coupled nanocavity, which supports two near-degenerate, orthogonally-polarised cavity modes. The chiral behaviour arises due to direction-dependent interference between the cavity modes upon coupling to two single-mode output waveguides. Notably, an experimentally realistic cavity design simultaneously supports near-unity chiral contrast, efficient ($\beta >0.95$) waveguide coupling and enhanced light-matter interaction strength (Purcell factor $F_P>70$). In combination, these parameters could enable the development of highly coherent spin-photon interfaces, ready for integration into nanophotonic circuits.

arXiv comment19 pages, 5 figures

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• Topological multi-mode waveguide QED
• Chiral quantum optics: recent developments, and future directions
• Chiral quantum optics in the bulk of photonic quantum Hall systems
• Chiral Interaction Induced Near-Perfect Photon Blockade
• Self-Ordering of Individual Photons in Waveguide QED and Rydberg-Atom Arrays
• Chiral Flat-Band Optical Cavity with Atomically Thin Mirrors
• Frustration and chirality in three-dimensional trillium lattices: Insights and Perspectives
• Directional emission of nanoscale chiral sources modified by gap plasmons
• Routing single photons with quantum emitters coupled to nanostructures