Journal article Open Access
Defect Engineering for Quantum Grade Rare-Earth Nanocrystals
Liu, Shuping; Fossati, Alexandre; Serrano, Diana; Tallaire, Alexandre; Ferrier, Alban; Goldner, Philippe
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<dct:title>Defect Engineering for Quantum Grade Rare-Earth Nanocrystals</dct:title>
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<dcat:keyword>Nanoparticles</dcat:keyword>
<dcat:keyword>Rare earth</dcat:keyword>
<dcat:keyword>NanOQTech</dcat:keyword>
<dcat:keyword>Quantum Technologies</dcat:keyword>
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<dct:description><p>Nanostructured systems that combine optical and spin transitions offer new functionalities for quantum technologies by providing efficient quantum light&ndash;matter interfaces. Rare-earth (RE) ion-doped nanoparticles are promising in this field as they show long-lived optical and spin quantum states. However, further development of their use in highly demanding applications, such as scalable single-ion-based quantum processors, requires controlling defects that currently limit coherence lifetimes. In this work, we show that a post-treatment process that includes multistep high-temperature annealing followed by high-power microwave oxygen plasma processing advantageously improves key properties for quantum technologies. We obtain single crystalline Eu<sup>3+</sup>:Y<sub>2</sub>O<sub>3</sub>&nbsp;nanoparticles (NPs) of 100 nm diameter, presenting bulk-like inhomogeneous line widths (&Gamma;<sub>inh</sub>) and population lifetimes (<em>T</em><sub>1</sub>). Furthermore, a significant coherence lifetime (<em>T</em><sub>2</sub>) extension, up to a factor of 5, is successfully achieved by modifying the oxygen-related point defects in the NPs by the oxygen plasma treatment. These promising results confirm the potential of engineered RE NPs to integrate devices such as cavity-based single-photon sources, quantum memories, and processors. In addition, our strategy could be applied to a large variety of oxides to obtain outstanding crystalline quality NPs for a broad range of applications.</p></dct:description>
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<dct:title>Nanoscale Systems for Optical Quantum Technologies</dct:title>
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Indexed in
- Publication date:
- July 22, 2020
- DOI:
-
- Keyword(s):
- Nanoparticles Rare earth NanOQTech Quantum Technologies
- Grants:
-
European Commission:
- NanOQTech - Nanoscale Systems for Optical Quantum Technologies (712721)
- Communities:
- License (for files):
- Creative Commons Attribution 4.0 International