July 22, 2020 Journal article Open Access

Liu, Shuping; Fossati, Alexandre; Serrano, Diana; Tallaire, Alexandre; Ferrier, Alban; Goldner, Philippe

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  <dc:creator>Liu, Shuping</dc:creator>
  <dc:creator>Fossati, Alexandre</dc:creator>
  <dc:creator>Serrano, Diana</dc:creator>
  <dc:creator>Tallaire, Alexandre</dc:creator>
  <dc:creator>Ferrier, Alban</dc:creator>
  <dc:creator>Goldner, Philippe</dc:creator>
  <dc:date>2020-07-22</dc:date>
  <dc:description>Nanostructured systems that combine optical and spin transitions offer new functionalities for quantum technologies by providing efficient quantum light–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 Eu3+:Y2O3 nanoparticles (NPs) of 100 nm diameter, presenting bulk-like inhomogeneous line widths (Γinh) and population lifetimes (T1). Furthermore, a significant coherence lifetime (T2) 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.</dc:description>
  <dc:identifier>https://zenodo.org/record/4081028</dc:identifier>
  <dc:identifier>10.1021/acsnano.0c02971</dc:identifier>
  <dc:identifier>oai:zenodo.org:4081028</dc:identifier>
  <dc:relation>info:eu-repo/grantAgreement/EC/H2020/712721/</dc:relation>
  <dc:relation>url:https://zenodo.org/communities/nanoqtech-h2020</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by/4.0/legalcode</dc:rights>
  <dc:subject>Nanoparticles</dc:subject>
  <dc:subject>Rare earth</dc:subject>
  <dc:subject>NanOQTech</dc:subject>
  <dc:subject>Quantum Technologies</dc:subject>
  <dc:title>Defect Engineering for Quantum Grade Rare-Earth Nanocrystals</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
</oai_dc:dc>