SnV Centers in Nanophotonic Diamond Cavities for Quantum Networks Part II: Device Characterization

Color centers in diamond are a promising platform for realizing quantum networks as a spin-photon interface with access to naturally occurring ¹³C memory qubits. The nitrogen-vacancy (NV) center has been successfully used to realize a three-node quantum network. However, its low emission rate of coherent photons and sensitivity to surface charges make scaling to more nodes difficult.



The tin-vacancy (SnV) center has emerged as a compelling alternative due to its favorable optical properties and compatibility with nanophotonic structures. Here, we present the integration of SnV centers into photonic crystal cavities. These cavities promise to enhance the light-matter interaction, ultimately boosting the achievable rate of entanglement between nodes. We measure cavity properties at cryogenic temperatures and demonstrate in-situ frequency tuning through gas desorption. This technique is used to probe the cavity-SnV system.