Spin-dependent, directional light-matter interactions form the basis of chiral quantum networks. In the solid state, quantum emitters commonly possess circularly polarized optical transitions with spin-dependent handedness. We demonstrate numerically that spin-dependent chiral coupling can be realized by embedding such an emitter in a waveguide-coupled nanocavity, which supports two near-degenerate, orthogonally polarized cavity modes. The chiral behavior 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 (>95%) cavity-waveguide coupling and enhanced light-matter interaction strength (Purcell factor > 70). In combination, these parameters enable the development of highly coherent spin-photon interfaces ready for integration into nanophotonic circuits.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9007567 | PMC |
| http://dx.doi.org/10.1021/acsphotonics.1c01806 | DOI Listing |
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