Single germanium vacancy centres in nanodiamonds with bulk-like spectral stability

• URL: http://arxiv.org/abs/2010.15475v1
• Date: Thu, 29 Oct 2020 10:44:56 GMT
• Title: Single germanium vacancy centres in nanodiamonds with bulk-like spectral stability
• Authors: Mackrine Nahra, Daniel Alshamaa, Regis Deturche, Valery Davydov, Ludmila Kulikova, Viatcheslav Agafonov and Christophe Couteau
• Abstract summary: We study single germanium-vacancy (GeV$-$) centres in nanodiamonds (NDs) for hybrid technology requiring a single photon source. We characterize their zero-phonon line (ZPL), study their internal population dynamics and compare their emission properties.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Motivated by the success of group IV colour centres in nanodiamonds (NDs) for hybrid technology requiring a single photon source, we study single germanium-vacancy (GeV$^-$) centres in NDs at room temperature with size rangingfrom 10 to 50 nm and with remarkable spectral properties. We characterize their zero-phonon line (ZPL), study their internal population dynamics and compare their emission properties in the framework of a three level model with intensity dependent de-shelving. Furthermore, we characterize their lifetime, polarization and brightness. We find amaximum photon emission count rate of 1.6 MHz at saturation. We also report a polarization visibility of 92% from the fluorescence light, which potentially makes GeV$^-$ centres good candidates for quantum key distribution (QKD)requiring polarized single photons. We show that the GeV$^-$ in NDs presented in this work have a comparable spectral stability compared to their bulk counterpart which is needed for future applications using NDs.

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