Journal article Open Access

Coherence Time Extension by Large-Scale Optical Spin Polarization in a Rare-Earth Doped Crystal

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

Dublin Core Export

<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <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: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: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>
Views 77
Downloads 17
Data volume 44.1 MB
Unique views 73
Unique downloads 16


Cite as