Silicon-Vacancy Centers in Nanodiamonds for Applications in Quantum Networks

POSTER

Abstract

Combining conventional photonic systems with the good optical and spin properties of group IV defects in diamond puts a platform for quantum technologies into reach. Here, we present measurements of characteristic optical and spin properties of negatively-charged Silicon-vacancy centers (SiV) in diamond [1]. At liquid Helium temperatures latter properties are strongly degraded due to interaction with the surrounding phonon bath leading to fast spin dephasing [2]. In our approach, we use nanodiamonds as a host which modifies the aforementioned characteristic features of SiV [3], thereby revealing key benefits with regards to spin coherence compared to conventional bulk diamonds while simultaneously enabling future hybridization with photonic structures, e.g. photonic crystal or open micro-cavities [4,5].

*The project was funded by the BMBF/VDI in projectsHybridQToken, QR.X and Spinning.

Publication: [1] Waltrich, Richard, et al. "Two-photon interference from silicon-vacancy centers in remote nanodiamonds." Nanophotonics 12.18 (2023): 3663-3669.
[2] Meesala, Srujan, et al. "Strain engineering of the silicon-vacancy center in diamond." Physical Review B 97.20 (2018): 205444.
[3] Klotz, Marco, et al. "Prolonged Orbital Relaxation by Locally Modified Phonon Density of States for the Si V− Center in Nanodiamonds." Physical Review Letters 128.15 (2022): 153602.
[4] Bayer, Gregor, et al. "Optical driving, spin initialization and readout of single SiV− centers in a Fabry-Perot resonator." Communications Physics 6.1 (2023): 300.
[5] Fehler, Konstantin G., et al. "Hybrid quantum photonics based on artificial atoms placed inside one hole of a photonic crystal cavity." ACS photonics 8.9 (2021): 2635-2641.

Presenters

  • Marco Klotz

    • Institut für Quantenoptik
    • University Ulm, Insitute for Quantum Optics, Germany

Authors

  • Marco Klotz

    • Institut für Quantenoptik
    • University Ulm, Insitute for Quantum Optics, Germany

  • Andreas Tangemann

    • University Ulm

  • Richard Waltrich

    • University Ulm
    • University Ulm, Institute for Quantum Optics

  • Viatcheslav N Agafonov

    • GREMAN, UMR 7347 CNRS, INSA-CVL, Tours University, 37200 Tours, France
    • GREMAN, UMR 7347 CNRS, INSA-CVL, Tours University, France

  • Alexander Kubanek

    • University Ulm
    • Ulm University/Institute for Quantum Optics
    • Institute for Quantum Optics, Ulm University, D-89081 Ulm
    • Institute for Quantum Optics, Ulm University, Ulm, Germany
    • University Ulm, Insitute for Quantum Optics, Germany
    • University Ulm, Institute for Quantum Optics