paper

High-efficiency vertical emission spin-photon interface for scalable quantum memories

arXiv:2503.20111 · doi:10.22331/q-2026-03-20-2035

Abstract

We present an efficient spin-photon interface for free-space vertical emission coupling. Using a \rev{dipole model}, we show that our design achieves a far-field collection efficiency of 96\% at the numerical aperture of 0.7 with a 95\% overlap to a Gaussian mode. Our approach is based on a dual perturbation layer design. The first perturbation layer extracts and redirects the resonant mode of a diamond microdisk resonator around the optical axis. The second perturbation layer suppresses side lobes and concentrates most of the light intensity near the center. This dual-layer design enhances control over the farfield pattern and also reduces alignment sensitivity. Additionally, the implemented \rev{dipole model} performs calculations \( 3.2 \times 10^6 \) times faster than full-wave FDTD simulations. These features make the design promising for quantum information applications.

10 pages, 4 figures

References in corpus (16)