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Main Title: Deterministically fabricated strain-tunable quantum dot single-photon sources emitting in the telecom O-band
Author(s): Srocka, N.
Mrowiński, P.
Große, J.
Schmidt, M.
Rodt, Sven
Reitzenstein, Stephan
Type: Article
Language Code: en
Abstract: Most quantum communication schemes aim at the long-distance transmission of quantum information. In the quantum repeater concept, the transmission line is subdivided into shorter links interconnected by entanglement distribution via Bell-state measurements to overcome inherent channel losses. This concept requires on-demand single-photon sources with a high degree of multi-photon suppression and high indistinguishability within each repeater node. For a successful operation of the repeater, a spectral matching of remote quantum light sources is essential. We present a spectrally tunable single-photon source emitting in the telecom O-band with the potential to function as a building block of a quantum communication network based on optical fibers. A thin membrane of GaAs embedding InGaAs quantum dots (QDs) is attached onto a piezoelectric actuator via gold thermocompression bonding. Here, the thin gold layer acts simultaneously as an electrical contact, strain transmission medium, and broadband backside mirror for the QD-micromesa. The nanofabrication of the QD-micromesa is based on in situ electron-beam lithography, which makes it possible to integrate pre-selected single QDs deterministically into the center of monolithic micromesa structures. The QD pre-selection is based on distinct single-QD properties, signal intensity, and emission energy. In combination with strain-induced fine tuning, this offers a robust method to achieve spectral resonance in the emission of remote QDs. We show that the spectral tuning has no detectable influence on the multi-photon suppression with g(2)(0) as low as 2%–4% and that the emission can be stabilized to an accuracy of 4 μeV using a closed-loop optical feedback.
Issue Date: 1-Dec-2020
Date Available: 13-Jan-2021
DDC Class: 530 Physik
Subject(s): nanofabrication
optical fibers
quantum dots
electrical components
telecommunications engineering
electron-beam lithography
scanning electron microscopy
quantum information
emission spectroscopy
Journal Title: Applied Physics Letters
Publisher: American Institute of Physics
Publisher Place: New York, NY
Volume: 117
Issue: 22
Article Number: 224001
Publisher DOI: 10.1063/5.0030991
EISSN: 1077-3118
ISSN: 0003-6951
Appears in Collections:AG Optoelektronik und Quantenbauelemente » Publications

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