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SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 7: Poster I

Q 7.25: Poster

Monday, March 6, 2023, 16:30–19:00, Empore Lichthof

Optical Microcavity with Coupled Single SiV Centers in a Nanodiamond for a Quantum Repeater Platform — •Selene Sachero1, Robert Berghaus1, Gregor Bayer1, Andrea B Filipovski1, Lukas Antoniuk1, Niklas Lettner1, Richard Waltrich1, Marco Klotz1, Patrick Maier1, Viatcheslav Agafonov2, and Alexander Kubanek11Institute 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 ≈ 1µm, 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.

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