Highly indistinguishable photons from deterministic quantum-dot microlenses utilizing three-dimensional in situ electron-beam lithography
Open accessAbstract
The success of advanced quantum communication relies crucially on non-classical light sources emitting single indistinguishable photons at high flux rates and purity. We report on deterministically fabricated microlenses with single quantum dots inside which fulfil these requirements in a flexible and robust quantum device approach. In our concept we combine cathodoluminescence spectroscopy with advanced in situ three-dimensional electron-beam lithography at cryogenic temperatures to pattern monolithic microlenses precisely aligned to pre-selected single quantum dots above a distributed Bragg reflector. We demonstrate that the resulting deterministic quantum-dot microlenses enhance the photon-extraction efficiency to (23±3)%. Furthermore we prove that such microlenses assure close to pure emission of triggered single photons with a high degree of photon indistinguishability up to (80±7)% at saturation. As a unique feature, both single-photon purity and photon indistinguishability are preserved at high excitation power and pulsed excitation, even above saturation of the quantum emitter.
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The single-photon nature of collected RF at π pulse is evident from second-order coherence measurement, with nearly vanishing multiphoton probability at zero delay [g2(0)=0.009(1)].
“The single-photon nature of the collected RF at the π pulse is evident from the second-order coherence measurement [22] shown in Fig. 2(c), where nearly vanishing multiphoton probability is observed at zero delay [g 2 ð0Þ ¼ 0.009ð1Þ].”
From On-Demand Single Photons with High Extraction Efficiency and Near-Unity Indistinguishability from a Resonantly Driven Quantum Dot in a Micropillar (2016) · cites this paper as [22]
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References 38 · Cited by 315
Research works printed but not linked: 1
- Michler P. in Nanoscience and Technology Springer (2009).
- Authors
- Gschrey, M., Thoma, A., Schnauber, P., Seifried, M., Schmidt, R., Wohlfeil, B., Krüger, L., Schulze, J. H., Heindel, T., Burger, S., Schmidt, F., Strittmatter, A., Rodt, S., & Reitzenstein, S.
- Affiliations
- Technische Universität Berlin (DE)
- Zuse Institute Berlin (DE)
- Corresponding author
- Reitzenstein, S.
- ORCID
- Venue
- Nature Communications
- Published
- 2015-07-16
- Volume
- 6
- Issue
- 1
- Pages
- 7662-7662
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC4518279
- OpenAlex
- W2267188140
- Cited by
- 315
- References
- 38
- Citations by year
- 2026: 9 · 2025: 13 · 2024: 20 · 2023: 27 · 2022: 25 · 2021: 26 · 2020: 41 · 2019: 41 · 2018: 33 · 2017: 41 · 2016: 31 · 2015: 8
- FWCI
- 19.14
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Nature Communications (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Funders
- Deutsche Forschungsgemeinschaft (SFB 787)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Semiconductor Quantum Structures and Devices
- Physical Sciences › Materials Science › Materials Chemistry › Quantum Dots Synthesis And Properties
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Semiconductor Lasers and Optical Devices
- Keywords
- single-photon sources, photon indistinguishability, single-photon purity, distributed Bragg reflector, photon extraction efficiency, quantum communication, pulsed excitation
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