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

• URL: http://arxiv.org/abs/2108.01462v3
• Date: Fri, 28 Jan 2022 12:50:55 GMT
• Title: Engineering strong chiral light-matter interactions in a waveguide-coupled nanocavity
• Authors: D. Hallett, A. P. Foster, D. M. Whittaker, M. S. Skolnick, L. R. Wilson
• Abstract summary: In the solid state, quantum emitters commonly possess circularly polarised optical transitions with spin-dependent handedness. We demonstrate that spin-dependent chiral coupling can be realised by embedding such an emitter in a waveguide-coupled nanocavity.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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