September 16, 2020 Journal article Open Access

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

JSON-LD (schema.org) Export

{
  "description": "<p>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,&nbsp;171Yb3+\u2236Y2SiO5. Indeed, more than 90% spin polarization has been achieved at 2&nbsp;K and zero magnetic field. Using this spin polarization mechanism, we further demonstrate an increase in optical coherence lifetime from 0.3&nbsp;ms to 0.8&nbsp;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.</p>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "IRCP", 
      "@type": "Person", 
      "name": "Welinski, Sacha"
    }, 
    {
      "affiliation": "IRCP", 
      "@type": "Person", 
      "name": "Tiranov,  Alexey"
    }, 
    {
      "affiliation": "University of Geneva", 
      "@type": "Person", 
      "name": "Businger, Moritz"
    }, 
    {
      "affiliation": "IRCP", 
      "@type": "Person", 
      "name": "Ferrier, Alban"
    }, 
    {
      "affiliation": "University of Geneva", 
      "@type": "Person", 
      "name": "Afzelius, Mikael"
    }, 
    {
      "affiliation": "IRCP", 
      "@type": "Person", 
      "name": "Goldner, Philippe"
    }
  ], 
  "headline": "Coherence Time Extension by Large-Scale Optical Spin Polarization in a Rare-Earth Doped Crystal", 
  "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", 
  "datePublished": "2020-09-16", 
  "url": "https://zenodo.org/record/4081237", 
  "version": "1", 
  "keywords": [
    "NanOQTech", 
    "Quantum Technologies", 
    "Rare earth", 
    "Coherence time"
  ], 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.1103/PhysRevX.10.031060", 
  "@id": "https://doi.org/10.1103/PhysRevX.10.031060", 
  "@type": "ScholarlyArticle", 
  "name": "Coherence Time Extension by Large-Scale Optical Spin Polarization in a Rare-Earth Doped Crystal"
}