September 16, 2020 Journal article Open Access

Welinski, Sacha; Tiranov, Alexey; Businger, Moritz; Ferrier, Alban; Afzelius, Mikael; Goldner, Philippe

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  <dc:creator>Welinski, Sacha</dc:creator>
  <dc:creator>Tiranov,  Alexey</dc:creator>
  <dc:creator>Businger, Moritz</dc:creator>
  <dc:creator>Ferrier, Alban</dc:creator>
  <dc:creator>Afzelius, Mikael</dc:creator>
  <dc:creator>Goldner, Philippe</dc:creator>
  <dc:date>2020-09-16</dc:date>
  <dc:description>Optically addressable spins are actively investigated in quantum communication, processing, and sensing. Optical and spin coherence lifetimes, which determine quantum operation fidelity and storage time, are often limited by spin-spin interactions, which can be decreased by polarizing spins. Spin polarization can be achieved using optical pumping, large magnetic fields, or mK-range temperatures. Here, we show that optical pumping of a small fraction of ions with a fixed-frequency laser, coupled with spin-spin interactions and spin diffusion, leads to substantial spin polarization in a paramagnetic rare-earth doped crystal, 171Yb3+∶Y2SiO5. Indeed, more than 90% spin polarization has been achieved at 2 K and zero magnetic field. Using this spin polarization mechanism, we further demonstrate an increase in optical coherence lifetime from 0.3 ms to 0.8 ms, due to a strong decrease in spin-spin interactions. This effect opens the way to new schemes for obtaining long optical and spin coherence lifetimes in various solid-state systems such as ensembles of rare-earth ions or color centers in diamond, which are of interest for a broad range of quantum technologies.</dc:description>
  <dc:identifier>https://zenodo.org/record/4081237</dc:identifier>
  <dc:identifier>10.1103/PhysRevX.10.031060</dc:identifier>
  <dc:identifier>oai:zenodo.org:4081237</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>NanOQTech</dc:subject>
  <dc:subject>Quantum Technologies</dc:subject>
  <dc:subject>Rare earth</dc:subject>
  <dc:subject>Coherence time</dc:subject>
  <dc:title>Coherence Time Extension by Large-Scale Optical Spin Polarization in a Rare-Earth Doped Crystal</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
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