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Group IV color centers in nanodiamonds

Richard Waltrich

Published Jan 1, 2025• 0 citations
Publisher

Abstract

Color Centers in Diamond have great potential to be used as a source for quantum optic applications. Using nanodiamonds as a host material can improve physical properties and opens new possibilities for integration into hybrid systems. This theses explores fundamental properties of Group-IV color centers in nanodiamonds and their integration into photonic platforms such as microcavities, bullseye antennas and photonic crystal cavities.

DOI
10.18725/oparu-59475

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Color Centers in Diamond have great potential to be used as a source for quantum optic applications. Using nanodiamonds as a host material can improve physical properties and opens new possibilities for integration into hybrid systems. This theses explores fundamental properties of Group-IV color centers in nanodiamonds and their integration into photonic platforms such as microcavities, bullseye antennas and photonic crystal cavities.
We propose to couple single photons, generated by a germanium vacancy (GeV) / Silicon Vacancy (SiV) center located within one nanodiamond-ND, to other GeV centers in other nanodiamonds. We will then have a hybrid quantum photonic platform made of color centers that act as stationary matter qubits and single photons that act as flying qubits, connecting nodes together. Our initial attempt will be focused on establishing a two-node network and then look towards scaling up to a multiple node quantum network. To this extent, we shall study the spectral as well as correlation properties of group IV color centers embedded in nanodiamonds to choose suitable candidates for the proposed two node quantum network. We will elaborate on the process as well as applications of the proposed device in the context of quantum communication and networks. We will also look into the study the interaction of a magnetic ion with color centers in bulk diamond.
Optically active color centers in nanodiamonds offer unique opportunities for generating and manipulating quantum states of light. These mechanically, chemically, and optically robust emitters can be produced in mass quantities, deterministically manipulated, and integrated with a variety of quantum device geometries and photonic material platforms. Nanodiamonds with deeply sub-wavelength sizes coupled to nanophotonic structures feature a giant enhancement of light-matter interaction, promising high bitrates in quantum photonic systems. We review the recent advances in controlled techniques for synthesizing, selecting, and manipulating nanodiamond-based color centers for their integration with quantum nanophotonic devices.
Optically active color centers in nanodiamonds offer unique opportunities for generating and manipulating quantum states of light. These mechanically, chemically, and optically robust emitters can be produced in mass quantities, deterministically manipulated, and integrated with a variety of quantum device geometries and photonic material platforms. Nanodiamonds with deeply sub-wavelength sizes coupled to nanophotonic structures feature a giant enhancement of light-matter interaction, promising high bitrates in quantum photonic systems. We review the recent advances in controlled techniques for synthesizing, selecting, and manipulating nanodiamond-based color centers for their integration with quantum nanophotonic devices.
Abstract The progress in integration of nanodiamond with photonic devices is analyzed in the light of quantum optical applications. Nanodiamonds host a variety of optically active defects, called color centers, which provide rich ground for photonic engineering. Theoretical introduction describing light and matter interaction between optical modes and a quantum emitter is presented, including the role of the Debye–Waller factor typical of color center emission. The synthesis of diamond nanoparticles is discussed in an overview of methods leading to experimentally realized hybrid platforms of nanodiamond with gallium phosphide, silicon dioxide, and silicon carbide. The trade‐offs in the substrate index of refraction values are reviewed in the context of the achieved strength of light and matter interaction. Thereby, the recent results on the growth of color center‐rich nanodiamond on prefabricated silicon carbide microdisk resonators are presented. These hybrid devices achieve up to fivefold enhancement of the diamond color‐center light emission and can be employed in integrated quantum photonics.
The past two decades have seen great advances in developing color centers in diamond for sensing, quantum information processing, and tests of quantum foundations. Increasingly, the success of these applications as well as fundamental investigations of light–matter interaction depend on improved control of optical interactions with color centers—from better fluorescence collection to efficient and precise coupling with confined single optical modes. Wide ranging research efforts have been undertaken to address these demands through advanced nanofabrication of diamond. This review will cover recent advances in diamond nano- and microphotonic structures for efficient light collection, color center to nanocavity coupling, hybrid integration of diamond devices with other material systems, and the wide range of fabrication methods that have enabled these complex photonic diamond systems.