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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F24%3A73625462" target="_blank" >RIV/61989592:15310/24:73625462 - isvavai.cz</a>
Result on the web
<a href="https://elight.springeropen.com/articles/10.1186/s43593-024-00072-8" target="_blank" >https://elight.springeropen.com/articles/10.1186/s43593-024-00072-8</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1186/s43593-024-00072-8" target="_blank" >10.1186/s43593-024-00072-8</a>

Result language
angličtina
Original language name
A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
<a href="/en/project/GA21-18545S" target="_blank" >GA21-18545S: Photonic network assisted quantum metrology</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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