Year: 2025
Type: article
Abstract: This study investigates the performance of droplet‐etched GaAs quantum dots (QDs) integrated into micropillar structures using a deterministic fabrication technique. A unity QD positioning yield across 74 devices and consistent device performanceare demonstrated. Under p‐shell excitation, the QD decay dynamics within the micropillars exhibit biexponential behavior, accompanied by intensity fluctuations limiting the source efficiency to < 4.5%. Charge stabilization via low‐power above‐band LED excitation effectively reduces these fluctuations, doubling the source efficiency to 9%. Moreover, suppression of radiation modes is introduced by implementing cylindrical rings theoretically predicted to boost the collection efficiency by a factor of 4. Experimentally, only a modest improvement is obtained, underscoring the influence of even minor fabrication imperfections for this advanced design. These findings demonstrate the reliability of the deterministic fabrication approach in producing high‐yield, uniform devices, while offering detailed insights into the influence of charge noise and complex relaxation dynamics on the performance.
Source: Advanced Quantum Technologies
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,430
Funders: Villum Fonden, European Commission, Fundação de Amparo à Pesquisa do Estado de São Paulo, Austrian Science Fund, Carlsbergfondet, QuantERA, HORIZON EUROPE Framework Programme, HORIZON EUROPE Excellent Science, H2020 European Research Council, H2020 Research Infrastructures, HORIZON EUROPE European Innovation Council
Awards: Solid state single-photon sources for telecom frequencies, G2361878796, G2710589720, G388252207, G434337789, Quantum Optical Networks based on Exciton-polaritons, G4460664646, G4658490975, G5302217128, Access to European Infrastructure for Nanoelectronics, A Single-Photon Source Featuring Unity Efficiency And Unity Indistinguishability For Scalable Optical Quantum Information Processing, European Photonic Quantum Computer, G6225469397, G678126929, G7328051726, Access to European Infrastructure for Nanoelectronics, G8246245635, G8590477180
OpenAlex ID: W4411254555