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

### Citation Style Language JSON Export

{
"DOI": "10.1103/PhysRevX.10.031060",
"author": [
{
"family": "Welinski, Sacha"
},
{
"family": "Tiranov,  Alexey"
},
{
"family": "Businger, Moritz"
},
{
"family": "Ferrier, Alban"
},
{
"family": "Afzelius, Mikael"
},
{
"family": "Goldner, Philippe"
}
],
"issued": {
"date-parts": [
[
2020,
9,
16
]
]
},
"abstract": "<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>",
"title": "Coherence Time Extension by Large-Scale Optical Spin Polarization in a Rare-Earth Doped Crystal",
"version": "1",
"type": "article-journal",
"id": "4081237"
}
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