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

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 bright...

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Published in:eLight 2024, Vol.4 (1), p.13, Article 13
Main Authors: Rota, Michele B., Krieger, Tobias M., Buchinger, Quirin, Beccaceci, Mattia, Neuwirth, Julia, Huet, Hêlio, Horová, Nikola, Lovicu, Gabriele, Ronco, Giuseppe, Covre da Silva, Saimon F., Pettinari, Giorgio, Moczała-Dusanowska, Magdalena, Kohlberger, Christoph, Manna, Santanu, Stroj, Sandra, Freund, Julia, Yuan, Xueyong, Schneider, Christian, Ježek, Miroslav, Höfling, Sven, Basso Basset, Francesco, Huber-Loyola, Tobias, Rastelli, Armando, Trotta, Rinaldo
Format: Article
Language:English
Subjects:
Efficiency
Electrons
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quantum dots
Research Article
Citations: Items that this one cites
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Summary: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.
ISSN:2097-1710
2662-8643
2662-8643
DOI:10.1186/s43593-024-00072-8