Abstract
We study the coupling between germanium vacancy centers (GeV−) in diamond and a one-dimensional photonic crystal (PhC) cavity. In such a system, the high values of the Q/V ratio featured by the cavity modes leads to an enhancement of the lightmatter interaction of the GeV− centers, enabling new functionalities such as deterministic generation of single photons, long-distance entanglement distribution or long-term storage of photonic qubits, among others. We compare two different device architectures: freestanding diamond PhC cavities and GaP PhC cavities evanescently coupled to a diamond substrate. In both cases, the cavity mode is formed by adiabatically increasing the cavity period from a central region where light is confined to the mirror region where light is reflected. We find that despite the lower refractive index, diamond-based cavities exhibit lower modal volumes than GaPbased cavities. This finding, when combined with the fact that in diamond-based cavities the GeV−centers are closer to the mode maximum, makes them a better candidate over the GaP-based devices. Related Research Topics
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