Regensburg 2022 – wissenschaftliches Programm
QI 4.12: Poster
Montag, 5. September 2022, 18:00–20:00, P2
Cavity-enhanced spectroscopy of molecular quantum emitters — •Evgenij Vasilenko, Weizhe Li, Nicholas Jobbitt, Senthil Kuppusamy, Mario Ruben, and David Hunger — Kalrsruhe Institute of Technology (KIT)
Rare earth ions in solid-state hosts are a promising candidate for optically addressable spin qubits, owing to their excellent optical and spin coherence times. Recently, also rare earth ion-based molecular complexes have shown excellent optical coherence properties .
Due to the long optical lifetime of the optical transition 5D0-7F0, an efficient spin-photon interface for quantum information processing requires the coupling of single ions to a microcavity.
Open-access Fabry-Pérot fiber cavities have been demonstrated to achieve high quality factors and low mode volumes, while simultaneously offering large tunability and efficient collection of the cavity mode . Since the used molecular quantum emitters require a cryogenic environment, the demands on mechanical stability of the cavity setup have a high priority.
To tackle these challenges, we report on the development of a monolithic type of cavity assembly, sacrificing some lateral scanning ability for the purpose of significantly increasing the passive stability.
We integrate molecules into the cavity in the form of a crystalline thin film on a macroscopic mirror and identify a sub-nanometer local surface roughness, sufficient to avoid excessive scattering loss. We report on first studies of cavity-enhanced emission spectroscopy.
 Serrano et al., to appear in Nature, arXiv:2105.07081
 Hunger et al., New J. Phys 12, 065038 (2010)