SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 14: Quantum Technologies: Color Centers I (joint session Q/A/QI)
Q 14.7: Vortrag
Montag, 6. März 2023, 18:30–18:45, F342
Optical Microcavity with Coupled Single SiV- Centers in a Nanodiamond for a Quantum Repeater Platform — •Robert Berghaus1, Gregor Bayer1, Selene Sachero1, Andrea B Filipovski1, Lukas Antoniuk1, Niklas Lettner1, Richard Waltrich1, Marco Klotz1, Patrick Maier1, Viatcheslav Agafonov2, and Alexander Kubanek1 — 1Institute for Quantum Optics, Ulm University, Germany — 2Tours University, France
A quantum repeater node requires a long-lived memory that can be addressed coherently. Additionally, efficient writing and reading of quantum states with high rates are crucial. Optical cavities can be used as spin-photon platforms to accomplish such requirements.
By coupling silicon vacancy defect centers (SiV-) in a nanodiamond to an open Fabry-Pérot cavity, our work paves the way for a light-matter interface with efficient coherent control. Our fully tunable cavity formed by two Bragg mirrors allows short cavity lengths down to ≈ 1 µm and provides efficient coupling of the quantum emitter at liquid helium temperatures.
Here, we perform photoluminescence measurements of SiV- centers and power-dependent photoluminescence excitation of single SiV centers by collecting the cavity modulated sideband. We observe spectrally stable emitters and measure a linewidth close to the Fourier limit below Δ ν = 200 MHz. With the Purcell-enhanced cavity signal we demonstrate coherent optical driving and access the electron spin all-optical in a strong external magnetic field. The electron spin can be initialized within 67 ns and a lifetime of 350 ns is reached.