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Towards two-photon interference from remote and tunable SnV centers in Diamond.

Colin Sauerzapf, Vladislav Bushmakin, Oliver von Berg, Sreehari Jayaram, Andrej Denisenko, Vadim Vorobyov, Jörg Wrachtrup

Published Jan 1, 2025• 0 citations
Publisher

Abstract

Tin-vacancy centers in diamond are promising candidates for quantum network nodes. We demonstrate a narrow inhomogeneous emission distribution, stable emission frequencies, and progress towards two-node photon interference using Stark-tuned frequency matching.
DOI
10.1364/cleo_fs.2025.ff112_5

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The realization of quantum networks critically depends on establishing efficient, coherent light-matter interfaces. Optically active spins in diamond have emerged as promising quantum nodes based on their spin-selective optical transitions, long-lived spin ground states, and potential for integration with nanophotonics. Tin-vacancy (SnV -^{\,\textrm{-}}-) centers in diamond are of particular interest because they exhibit narrow-linewidth emission in nanostructures and possess long spin coherence times at temperatures above 1 K. However, a nanophotonic interface for SnV -^{\,\textrm{-}}- centers has not yet been realized. Here, we report cavity enhancement of the emission of SnV -^{\,\textrm{-}}- centers in diamond. We integrate SnV -^{\,\textrm{-}}- centers into one-dimensional photonic crystal resonators and observe a 40-fold increase in emission intensity. The Purcell factor of the coupled system is 25, resulting in channeling of the majority of photons (90%90\%90%) into the cavity mode. Our results pave the way for the creation of efficient, scalable spin-photon interfaces based on SnV -^{\,\textrm{-}}- centers in diamond.