Journal article Open Access

# Quantum Dots for Single- and Entangled-Photon Emitters

Bimberg, Dieter; Stock, Erik; Lochmann, Anatol; Schliwa, Andrei; Tofflinger, J. A.; Unrau, Waldemar; Munnix, M.; Rodt, Sven; Toropov, Aleksandr I.; Bakarov, Askhat; Haisler, Vladimir A.; Kalagin, Aleksandr K.

### DataCite XML Export

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<identifier identifierType="URL">https://zenodo.org/record/896351</identifier>
<creators>
<creator>
<creatorName>Bimberg, Dieter</creatorName>
</creator>
<creator>
<creatorName>Stock, Erik</creatorName>
</creator>
<creator>
<creatorName>Lochmann, Anatol</creatorName>
</creator>
<creator>
<creatorName>Schliwa, Andrei</creatorName>
</creator>
<creator>
<creatorName>Tofflinger, J. A.</creatorName>
</creator>
<creator>
<creatorName>Unrau, Waldemar</creatorName>
</creator>
<creator>
<creatorName>Munnix, M.</creatorName>
</creator>
<creator>
<creatorName>Rodt, Sven</creatorName>
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<creator>
<creatorName>Toropov, Aleksandr I.</creatorName>
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<creator>
</creator>
<creator>
</creator>
<creator>
<creatorName>Kalagin, Aleksandr K.</creatorName>
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<titles>
<title>Quantum Dots For Single- And Entangled-Photon Emitters</title>
</titles>
<publisher>Zenodo</publisher>
<publicationYear>2009</publicationYear>
<dates>
<date dateType="Issued">2009-07-01</date>
</dates>
<resourceType resourceTypeGeneral="Text">Journal article</resourceType>
<alternateIdentifiers>
<alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/896351</alternateIdentifier>
</alternateIdentifiers>
<relatedIdentifiers>
<relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1109/jphot.2009.2025329</relatedIdentifier>
</relatedIdentifiers>
<rightsList>
<rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
</rightsList>
<descriptions>
<description descriptionType="Abstract">The efficient generation of polarized single or entangled photons is a crucial requirement for the implementation of quantum key distribution (QKD) systems. Self-organized semiconductor quantum dots (QDs) are capable of emitting one polarized photon or an entangled photon pair at a time using appropriate electrical current injection. We realized a highly efficient single-photon source (SPS) based on well-established semiconductor technology: In a pin structure, a single electron and a single hole are funneled into a single InAs QD using a submicron AlOx current aperture. Efficient radiative recombination leads to emission of single polarized photons with an all-time record purity of the spectrum. Non-classicality of the emitted light without using additional spectral filtering is demonstrated. The out-coupling efficiency and the emission rate are increased by embedding the SPS into a micro-cavity. The design of the micro-cavity is based on detailed modeling to optimize its performance. The resulting resonant single-QD diode is driven at a repetition rate of 1 GHz, exhibiting a second-order correlation function of g(2)(0) = 0. Eventually, QDs grown on (111)-oriented substrates are proposed as a source of entangled photon pairs. Intrinsic symmetry-lowering effects leading to the splitting of the exciton bright states are shown to be absent for this substrate orientation. As a result, the XX rarr X rarr 0 recombination cascade of a QD can be used for the generation of entangled photons without further tuning of the fine-structure splitting via QD size and/or shape.</description>
</descriptions>
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