Abstract
The ability to prepare, optically read out and coherently control single quantum states is a key requirement for quantum information processing. Optically active solid-state emitters have emerged as promising candidates with their prospects for on-chip integration as quantum nodes and sources of coherent photons connecting these nodes. Under a strongly driving resonant laser field, such quantum emitters can exhibit quantum behaviour such as Autler–Townes splitting and the Mollow triplet spectrum. Here we demonstrate coherent control of a strongly driven optical transition in silicon vacancy centre in diamond. Rapid optical detection of photons enabled the observation of time-resolved coherent Rabi oscillations and the Mollow triplet spectrum. Detection with a probing transition further confirmed Autler–Townes splitting generated by a strong laser field. The coherence time of the emitted photons is comparable to its lifetime and robust under a very strong driving field, which is promising for the generation of indistinguishable photons.
Highlights
The ability to prepare, optically read out and coherently control single quantum states is a key requirement for quantum information processing
Despite the long spin coherence times of the nitrogen vacancy (NV), the defect suffers from low percentage (3–5%) of the total emission into its weak zero phonon line (ZPL) and from strong inhomogeneous broadening
The electronic structure and optical transitions of the negatively charged silicon vacancy (SiV) in diamond have been characterized in detail recently[28,29,30]
Summary
The ability to prepare, optically read out and coherently control single quantum states is a key requirement for quantum information processing. The SiV defect has become a promising candidate to be a key building block for quantum information processing. Towards this goal, preparation and coherent control of the emitted photons from SiV is a prerequisite. The emission under continuous wave (cw) laser excitation will exhibit the Mollow triplet spectrum[16], which is a hallmark for quantum coherent control and enables a robust approach to generate single photons with detuned frequency from the resonance[17,18,19,20,21,22,23,24,25]. Photon coherence, which is critical for photon interference in building a quantum network, has been characterized in both the low- and the high-power regime
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