Spectroscopic Investigations of the Group IV spin qubits in Diamond

Group-IV color centers in diamond are a promising light-matter interface for quantum networking devices [1,2] having demonstrated excellent optical properties [3] and long coherence times at millikelvin temperatures [4]. The negatively charged tin-vacancy center (SnV) is particularly interesting, as its large spin-orbit coupling offers strong protection against phonon dephasing and robust cyclicity of its optical transitions toward spin-photon-entanglement schemes [5]. Recently both full quantum control of the spin qubit [6] and high-quality intrinsic photonic properties [7] have been demonstrated, which combined with integration into photonic nanostructures [8] make the SnV a competitive spin-photon building block for quantum networks. Here we further investigate the spectroscopic properties of these promising spin qubits as a basis for entangled state generation.



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