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Resonance Fluorescence of GaAs Quantum Dots with Near-Unity Photon Indistinguishability
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany.;Tech Univ Munich, Phys Dept, D-85748 Garching, Germany..ORCID iD: 0000-0002-1943-7603
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.ORCID iD: 0000-0003-0043-2527
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2019 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 19, no 4, p. 2404-2410Article in journal (Refereed) Published
Abstract [en]

Photonic quantum technologies call for scalable quantum light sources that can be integrated, while providing the end user with single and entangled photons on demand. One promising candidate is strain free GaAs/A1GaAs quantum dots obtained by aluminum droplet etching. Such quantum dots exhibit ultra low multi-photon probability and an unprecedented degree of photon pair entanglement. However, different to commonly studied InGaAs/GaAs quantum dots obtained by the Stranski-Krastanow mode, photons with a near-unity indistinguishability from these quantum emitters have proven to be elusive so far. Here, we show on-demand generation of near-unity indistinguishable photons from these quantum emitters by exploring pulsed resonance fluorescence. Given the short intrinsic lifetime of excitons and trions confined in the GaAs quantum dots, we show single photon indistinguishability with a raw visibility of V-raw = (95.0(-6.1)(+5.0))%, without the need for Purcell enhancement. Our results represent a milestone in the advance of GaAs quantum dots by demonstrating the final missing property standing in the way of using these emitters as a key component in quantum communication applications, e.g., as quantum light sources for quantum repeater architectures.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 19, no 4, p. 2404-2410
Keywords [en]
Semiconductor quantum dot, resonance fluorescence, indistinguishable photons, Al droplet etching
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-251341DOI: 10.1021/acs.nanolett.8b05132ISI: 000464769100028PubMedID: 30862165Scopus ID: 2-s2.0-85063372001OAI: oai:DiVA.org:kth-251341DiVA, id: diva2:1317091
Note

QC 20190521

Available from: 2019-05-21 Created: 2019-05-21 Last updated: 2019-05-21Bibliographically approved

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Schöll, EvaSchweickert, LucasZeuner, Katharina D.Lettner, ThomasZwiller, ValJöns, Klaus D.

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