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Main Title: Deterministically fabricated spectrally-tunable quantum dot based single-photon source
Author(s): Schmidt, Marco
Helversen, Martin V.
Fischbach, Sarah
Kaganskiy, Arsenty
Schmidt, Ronny
Schliwa, Andrei
Heindel, Tobias
Rodt, Sven
Reitzenstein, Stephan
Type: Article
Language Code: en
Abstract: Spectrally-tunable quantum light sources are key elements for the realization of long-distance quantum communication. A deterministically fabricated single-photon source with a photon extraction efficiency of η =(20 ± 2) %, a maximum tuning range of ΔE = 2.5 meV and a minimum g(2)(τ = 0) = 0.03 ± 0.02 is presented. The device consists of a single pre-selected quantum dot (QD) monolithically integrated into a microlens that is bonded onto a piezoelectric actuator via gold thermocompression bonding. Here, a thin gold layer simultaneously provides strain transfer and acts as a backside mirror for the QD-microlens to maximize the photon extraction efficiency. The QD-microlens structure is patterned via 3D in-situ electron-beam lithography (EBL), which allows us to pre-select and integrate suitable QDs based on their emission intensity and energy with a spectral accuracy of 1 meV for the final device. Together with strain fine-tuning, this enables the scalable realization of single-photon sources with identical emission energy. Moreover, we show that the emission energy of the source can be stabilized to µeV accuracy by closed-loop optical feedback. Thus, the combination of deterministic fabrication, spectral-tunability and high broadband photon-extraction efficiency makes the QD-microlens single-photon source an interesting building block for the realization of quantum communication networks.
Issue Date: 2020
Date Available: 13-Jan-2021
DDC Class: 530 Physik
Subject(s): single-photon source
spectrally-tunable quantum light sources
quantum communication
Sponsor/Funder: BMBF, 03V0630, Entwicklung einer Halbleiterbasierten Einzelphotonenquelle für die Quanteninformationstechnologie
BMBF, 13N14876, Quantenkommunikations-Systeme auf Basis von Einzelphotonenquellen (QuSecure)
DFG, 43659573, SFB 787: Halbleiter - Nanophotonik: Materialien, Modelle, Bauelemente
Journal Title: Optical Materials Express
Publisher: Optical Society of America
Publisher Place: Washington, DC
Volume: 10
Issue: 1
Publisher DOI: 10.1364/OME.10.000076
Page Start: 76
Page End: 87
EISSN: 2159-3930
Appears in Collections:AG Optoelektronik und Quantenbauelemente » Publications

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