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

### DataCite XML Export

<?xml version='1.0' encoding='utf-8'?>
<identifier identifierType="URL">https://zenodo.org/record/4081237</identifier>
<creators>
<creator>
<creatorName>Welinski, Sacha</creatorName>
<givenName>Sacha</givenName>
<familyName>Welinski</familyName>
<affiliation>IRCP</affiliation>
</creator>
<creator>
<creatorName>Tiranov,  Alexey</creatorName>
<givenName>Alexey</givenName>
<familyName>Tiranov</familyName>
<affiliation>IRCP</affiliation>
</creator>
<creator>
<creatorName>Businger, Moritz</creatorName>
<givenName>Moritz</givenName>
<familyName>Businger</familyName>
<affiliation>University of Geneva</affiliation>
</creator>
<creator>
<creatorName>Ferrier, Alban</creatorName>
<givenName>Alban</givenName>
<familyName>Ferrier</familyName>
<affiliation>IRCP</affiliation>
</creator>
<creator>
<creatorName>Afzelius, Mikael</creatorName>
<givenName>Mikael</givenName>
<familyName>Afzelius</familyName>
<affiliation>University of Geneva</affiliation>
</creator>
<creator>
<creatorName>Goldner, Philippe</creatorName>
<givenName>Philippe</givenName>
<familyName>Goldner</familyName>
<affiliation>IRCP</affiliation>
</creator>
</creators>
<titles>
<title>Coherence Time Extension by Large-Scale Optical Spin Polarization in a Rare-Earth Doped Crystal</title>
</titles>
<publisher>Zenodo</publisher>
<publicationYear>2020</publicationYear>
<subjects>
<subject>NanOQTech</subject>
<subject>Quantum Technologies</subject>
<subject>Rare earth</subject>
<subject>Coherence time</subject>
</subjects>
<dates>
<date dateType="Issued">2020-09-16</date>
</dates>
<resourceType resourceTypeGeneral="JournalArticle"/>
<alternateIdentifiers>
<alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/4081237</alternateIdentifier>
</alternateIdentifiers>
<relatedIdentifiers>
<relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1103/PhysRevX.10.031060</relatedIdentifier>
<relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://zenodo.org/communities/nanoqtech-h2020</relatedIdentifier>
</relatedIdentifiers>
<version>1</version>
<rightsList>
<rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
</rightsList>
<descriptions>
<description descriptionType="Abstract">&lt;p&gt;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,&amp;nbsp;171Yb3+∶Y2SiO5. Indeed, more than 90% spin polarization has been achieved at 2&amp;nbsp;K and zero magnetic field. Using this spin polarization mechanism, we further demonstrate an increase in optical coherence lifetime from 0.3&amp;nbsp;ms to 0.8&amp;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.&lt;/p&gt;</description>
</descriptions>
<fundingReferences>
<fundingReference>
<funderName>European Commission</funderName>
<funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/100010661</funderIdentifier>
<awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/712721/">712721</awardNumber>
<awardTitle>Nanoscale Systems for Optical Quantum Technologies</awardTitle>
</fundingReference>
</fundingReferences>
</resource>

77
17
views