A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot

Michele B. Rota; Tobias M. Krieger; Quirin Buchinger; Mattia Beccaceci; Julia Neuwirth; Hêlio Huet; Nikola Horová; Gabriele Lovicu; Giuseppe Ronco; Saimon F. Covre da Silva; Giorgio Pettinari; Magdalena Moczała-Dusanowska; Christoph Kohlberger; Santanu Manna; Sandra Stroj; Julia Freund; Xueyong Yuan; Christian Schneider; Miroslav Ježek; Sven Höfling; Francesco Basso Basset; Tobias Huber-Loyola; Armando Rastelli; Rinaldo Trotta

doi:10.1186/s43593-024-00072-8

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A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot

光：快讯（英文） 2024年4卷

RESEARCH ARTICLE | Updated：2024-09-25

- A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot
- A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot
- Affiliations：
  
  Dipartimento di Fisica, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185Rome, Italy
  Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Altenberger Strasse 69, 4040Linz, Austria
  Technische Physik, Universität Würzburg, Am Hubland, 97074Würzburg, Germany
  Department of Optics, Faculty of Science, Palacký University, 17. Listopadu 1192/12, 77900Olomouc, Czech Republic
  Present Address: Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, 13083-859Campinas, Brazil
  Institute for Photonics and Nanotechnologies, National Research Council, Via del Fosso del Cavaliere, 100, 00133Rome, Italy
  Research Center for Microtechnology, Vorarlberg University of Applied Sciences, Campus V, Hochschulstrasse 1, 6850Dornbirn, Austria
  Present Address: School of Physics, Southeast University, Nanjing 211189, China
  Institut für Physik, Fakultät V, Carl von Ossietzky, Universität Oldenburg, 26129Oldenburg, Germany
- Author bio：
  
  *Tobias Huber-Loyolatobias.huber@physik.uni-wuerzburg.de
  Armando Rastelliarmando.rastelli@jku.at
  Rinaldo Trottarinaldo.trotta@uniroma1.it
- Funds：
  
  European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Program(679183);(SPQRel), and the MUR (Ministero dell’Università e della Ricerca)(PE0000023-NQSTI);Project PRIN 2017 Taming complexity via Quantum Strategies a Hybrid Integrated Photonic approach (QUSHIP)(2017SRNBRK);RT and AR acknowledge the European Union’s Horizon 2020 Research and Innovation Program(899814 (Qurope));QuantERA II Programme that has received funding from the European Union’s Horizon 2020 Research and Innovation Programme(101017733);QD-E-QKD and the FFG(891366);RT, AR, and CS acknowledges the European Union’s Horizon 2020 (2014-2020)(731473);QuantERA project HYPER-U-P-S(8C18002);AR also acknowledges the European Union’s Horizon 2020 Research and Innovation Program(871130 (Ascent +));Austrian Science Fund (FWF) via the Research Group FG5, P 29603, I 4380, I 3762, the Linz Institute of Technology (LIT), and the LIT Secure and Correct Systems Lab, supported by the State of Upper Austria. THL acknowledges funding from the Federal Ministry of Education and Research (BMBF) through the Quantum Futur(13N16272);MJ acknowledges the Czech Science Foundation(21-18545S);European Union’s 2020 research and innovation program (CSA-Coordination and support action, H2020-WIDESPREAD-2020-5)(951737);QD-E-QKD, and Palacky University(IGA-PrF-2022-005;IGA-PrF-2023-006);National Natural Science Foundation of China(NSFC 12104090);“the Fundamental Research Funds for the Central Universities” and “Zhishan” Scholars Programs of Southeast University
- DOI：10.1186/s43593-024-00072-8
  中图分类号：
- 收稿日期：2024-04-30，
  
  修回日期：2024-06-10，
  
  录用日期：2024-06-17，
  
  网络出版日期：2024-07-24，
  
  纸质出版日期：2024-12
- Accepted：
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A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot[J]. 光：快讯（英文）, 2024,4.

Michele B. Rota, Tobias M. Krieger, Quirin Buchinger, et al. A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot[J]. Elight, 2024, 4.
A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot[J]. 光：快讯（英文）, 2024,4. DOI： 10.1186/s43593-024-00072-8.

Michele B. Rota, Tobias M. Krieger, Quirin Buchinger, et al. A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot[J]. Elight, 2024, 4. DOI： 10.1186/s43593-024-00072-8.

摘要

Abstract

A quantum-light source that delivers photons with a high brightness and a high degree of entanglement is fundamental for the development of efficient entanglement-based quantum-key distribution systems. Among all possible candidates

epitaxial quantum dots are currently emerging as one of the brightest sources of highly entangled photons. However

the optimization of both brightness and entanglement currently requires different technologies that are difficult to combine in a scalable manner. In this work

we overcome this challenge by developing a novel device consisting of a quantum dot embedded in a circular Bragg resonator

in turn

integrated onto a micromachined piezoelectric actuator. The resonator engineers the light-matter interaction to empower extraction efficiencies up to 0.69(4). Simultaneously

the actuator manipulates strain fields that tune the quantum dot for the generation of entangled photons with corrected fidelities to a maximally entangled state up to 0.96(1). This hybrid technology has the potential to overcome the limitations of the key rates that plague QD-based entangled sources for entanglement-based quantum key distribution and entanglement-based quantum networks.

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