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The ability to prepare, optically read out and coherently control singlequantum states is a key requirement for quantum information processing.Optically active solid state emitters have emerged as promising candidates withtheir prospects for on chip integration as quantum nodes and sources ofcoherent photons for connecting these nodes. Under strongly driving resonantlaser field, such quantum emitter can exhibit quantum behavior such asAutler-Townes splitting and Mollow triplet spectrum. Here we demonstratecoherent control of a strongly driven optical transition in silicon vacancy(SiV) center in diamond. Rapid optical detection of photons enabled theobservation of time resolved coherent Rabi oscillations and the Mollow tripletfrom an optical transition of a single SiV defect. Detection with a probingtransition further confirmed Autler-Townes splitting generated by a stronglaser field. Coherence time of the emitted photons is shown to be comparable toits lifetime and robust under very strong driving laser field, which ispromising for generation of indistinguishable photons.

Coherent control of a strongly driven silicon vacancy optical transition in diamond