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Symposium Latsis on Diamond Photonics - Physics, Technologies and Applications

Silicon-Vacancy Centers in a single crystal diamond membrane as efficient spin photon interface

Stefan Häußler, Richard Waltrich, Gregor W. Bayer, Alexander Kubanek

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We present coupling of the fluorescence of an ensemble of negatively-charged silicon-vacancy center embedded in a single crystal diamond membrane to the optical mode of a fiber based Fabry Perot cavity. The coupled system offers generation of coherent photons at high rates for various quantum optics applications.
DOI
10.1364/dp.2019.82

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We realize a potential platform for an efficient spin-photon interface, namely negatively-charged silicon-vacancy centers in a diamond membrane coupled to the mode of a fully-tunable, fiber-based, optical resonator. We demonstrate that introducing the thin ($\ensuremath{\sim}200\phantom{\rule{0.28em}{0ex}}\text{nm}$), single crystal diamond membrane into the mode of the resonator does not change the cavity properties, which is one of the crucial points for an efficient spin-photon interface. In particular, we observe constantly high Finesse values of up to 3000 and a linear dispersion in the presence of the membrane. We observe cavity-coupled fluorescence from an ensemble of ${\mathrm{SiV}}^{\ensuremath{-}}$ centers with an enhancement factor of $\ensuremath{\sim}1.9$. Furthermore from our investigations we extract the ensemble absorption and extrapolate an absorption cross section of $(2.9\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}12}\phantom{\rule{0.28em}{0ex}}{\text{cm}}^{2}$ for a single ${\mathrm{SiV}}^{\ensuremath{-}}$ center, much higher than previously reported.
The authors demonstrate on-chip diamond nanophotonics with a high-efficiency fiber-optic interface, achieving >90% power coupling at visible wavelengths. They use this approach to create a bright source of narrowband single photons, based on a silicon-vacancy color center embedded in a waveguide-coupled diamond photonic-crystal cavity. Their quantum nanophotonic interface yields a high flux of coherent single photons into a single-mode fiber, enabling possibilities for quantum networks that couple multiple emitters, either on the same chip or separated by long distances.
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A Quantum Repeater Platform based on Single SiV−^-− Centers in Diamond with Cavity-Assisted, All-Optical Spin Access and Fast Coherent Driving
Quantum key distribution enables secure communication based on the principles of quantum mechanics. The distance in fiber-based quantum communication is limited to about a hundred kilometers due to signal attenuation. Thus, quantum repeaters are required to establish large-scale quantum networks. Ideal quantum repeater nodes possess a quantum memory which is efficiently connected to photons, the carrier of quantum information. Color centers in diamond and, in particular, the negatively-charged silicon-vacancy centers are promising candidates to establish such nodes. The major obstacle is an inefficient connection between the color centers spin to the Gaussian optics of fiber networks. Here, we present an efficient spin-photon interface. Individual silicon-vacancy centers coupled to the mode of a hemispherical Fabry-Pérot microcavity show Purcell-factors larger than 1 when operated in a bath of liquid Helium. We demonstrate coherent optical driving with a Rabi frequency of 290 MHz290\,\mathrm{MHz}290MHz and all-optical access to the electron spin in strong magnetic fields of up to 3.2 T3.2\,\mathrm{T}3.2T. Spin initialization within 67 ns67\,\mathrm{ns}67ns with a fidelity of 80 %80\,\%80% and a lifetime of 350 ns350\,\mathrm{ns}350ns are reached inside the cavity. The spin-photon interface is passively stable, enabled by placing a color center containing nanodiamond in the hemispherical Fabry-Pérot mirror structure and by choosing short cavity lengths. Therefore, our demonstration opens the way to realize quantum repeater applications.