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Main Title: Deterministically fabricated quantum dot single-photon source emitting indistinguishable photons in the telecom O-band
Author(s): Srocka, N.
Mrowiński, P.
Große, J.
Helversen, M. von
Heindel, Tobias
Rodt, Sven
Reitzenstein, Stephan
Type: Article
Language Code: en
Abstract: In this work, we develop and study single-photon sources based on InGaAs quantum dots (QDs) emitting in the telecom O-band. Quantum devices are fabricated using in situ electron beam lithography in combination with thermocompression bonding to realize a backside gold mirror. Our structures are based on InGaAs/GaAs heterostructures, where the QD emission is redshifted toward the telecom O-band at 1.3 μm via a strain-reducing layer. QDs pre-selected by cathodoluminescence mapping are embedded into mesa structures with a backside gold mirror for enhanced photon-extraction efficiency. Photon-autocorrelation measurements under pulsed non-resonant wetting-layer excitation are performed at temperatures up to 40 K, showing pure single-photon emission, which makes the devices compatible with stand-alone operation using Stirling cryocoolers. Using pulsed p-shell excitation, we realize single-photon emission with a high multi-photon suppression of g(2)(0) = 0.027 ± 0.005, an as-measured two-photon interference visibility of (12 ± 4)%, a post-selected visibility of (96 ± 10)%, and an associated coherence time of (212 ± 25) ps. Moreover, the structures show an extraction efficiency of ∼5%, which is comparable to values expected from numeric simulations of this photonic structure. Further improvements of our devices will enable implementations of quantum communication via optical fibers.
Issue Date: 9-Jun-2020
Date Available: 13-Jan-2021
DDC Class: 530 Physik
Subject(s): luminescence
optical fibers
quantum dots
telecommunications engineering
electron-beam lithography
cooling technology
finite-element analysis
quantum information
Sponsor/Funder: BMBF, 13N14876, Quantenkommunikations-Systeme auf Basis von Einzelphotonenquellen (QuSecure)
Journal Title: Applied Physics Letters
Publisher: American Institute of Physics
Publisher Place: New York, NY
Volume: 116
Issue: 23
Article Number: 231104
Publisher DOI: 10.1063/5.0010436
EISSN: 1077-3118
ISSN: 0003-6951
Appears in Collections:AG Optoelektronik und Quantenbauelemente » Publications

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