Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.74: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Development of deterministic fabrication of quantum systems for single photon delay at Cesium wavelength — •Avijit Barua¹, Monica Pengerla¹, Lucas Bremer¹, Lucas Rickert¹, Jin-Dong Song², and Stephan Reitzenstein¹ — ¹Technische Universität Berlin, Berlin, Germany — ²Korea Institute of Science and Technology, Seoul, Republic of Korea

Semiconductor QDs are extensively investigated as single-photon sources for photonic quantum technology. The information that is encoded in single photons may be used as quantum interfaces between stationary and flying qubits. Here, we develop bright and strain-tunable QD single-photon sources at the Cs D1 transition wavelength (894 nm) to explore the storage ability of semiconductor QD in atomic quantum memories. The devices are designed and numerically optimized to maximize the extraction efficiency using the FEM solver JCMSuite. By considering circular Bragg resonators with up to 2 rings with integrated QDs and an Au-backside mirror we numerically demonstrate a photon extraction efficiency as high as 65% (NA = 0.4) and a Purcell factor of 0.72. In the experimental development, we realized hybrid CBGs which facilitate Piezo-strain tuning of the QD device. We then implement in-situ electron-beam lithography to precisely integrate the selected single QD at 894 nm in such a structure to create bright single-photon sources. Furthermore, the emission from the developed structures is studied by means of photon autocorrelation measurements, and light-matter interaction with Cs vapor is investigated.