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We propose a field-based design for dielectric antennas to interface diamondcolor centers with a Gaussian propagating far field. This antenna designenables an efficient spin-photon interface with a Purcell factor exceeding 400and a 93% mode overlap to a 0.4 numerical aperture far-field Gaussian mode. Theantenna design is robust to fabrication imperfections, such as variations inthe dimensions of the dielectric perturbations and the emitter dipole location.The field-based dielectric antenna design provides an efficient free-spaceinterface to closely packed arrays of quantum memories for multiplexed quantumrepeaters, arrayed quantum sensors, and modular quantum computers.

Field-based Design of a Resonant Dielectric Antenna for Coherent Spin-Photon Interfaces