CNT-QUANT - Nanocavity-Coupled Carbon Nanotubes for Quantum Photonics
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Further progress in photonic quantum technologies such as quantum communication and quantum information processing requires efficient and electrically pumped sources of individual photons or correlated photon pairs. State-of-the-art approaches for bright and deterministic sources of single indistinguishable photons with high extraction and collection efficiencies involve coupling between emitters and photonic or plasmonic cavities. The device integration of these interactions is generally limited to the visible spectral range and/or cryogenic conditions. The proposal aims to explore single-walled carbon nanotubes as a unique building block for quantum photonics at telecommunication wavelengths and at higher temperatures. Towards this end, several elements will be put together that had never been combined before. Operating at the quantum limit (i.e., with a single nanotube) the hybrid photonic-plasmonic nanocavities will enable the
advantageous features of both plasmonic and photonic modes to tailor the performance of nanotube-based quantum light sources. First, different methods for precise localization of emitters within the tailored nanostructures will be applied in combination with highly sensitive characterization techniques. In the second step, the large exciton oscillator strength and ultra-small mode confinement of the nanocavities will be used for achieving strong light-matter coupling at the quantum limit. Finally, owing to the high charge carrier mobility of semiconducting carbon nanotubes, the ultimate goal is to realize the corresponding effects under electrical excitation. It is expected that aside from overcoming the longstanding challenges in on-demand and high repetition rate quantum light generation close to room temperature, the successful realization of the outlined research will allow us to advance our understanding on the fundamental aspects of classical-to-quantum transition of light-matter interactions.