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HL: Fachverband Halbleiterphysik

HL 24: Quantum dots: Optics

HL 24.3: Vortrag

Mittwoch, 29. März 2023, 10:00–10:15, POT 151

Prospects of atomic vapor-based storage of single photons emitted by a deterministically fabricated quantum dot device — •Avijit Barua¹, Benjamin Maass², Norman Vincenz Ewald², Suk-in Park³, Sung-yul Park³, Jin-Dong Song³, Janik Wolters², and Stephan Reitzenstein¹ — ¹Technische Universität Berlin, Berlin, Germany — ²German Aerospace Center (DLR), Berlin, Germany — ³Korea Institute of Science and Technology, Seoul, Republic of Korea

Semiconductor quantum dots (QDs) are extensively investigated as single-photon sources for applications in photonic quantum technology. Here, we develop bright and strain-tunable QD single-photon sources at the Cs D1 transition wavelength and explore the storage ability of semiconductor QD in atomic quantum memories. The devices are designed and numerically optimized to maximize extraction efficiency using the finite element method. By considering circular Bragg resonators with integrated QDs and Au-backside mirror, we numerically demonstrate a photon extraction efficiency of 65% and a Purcell factor of 0.72. In the experimental development, we implement in-situ electron-beam lithography to precisely integrate selected single QDs at 894 nm in such structures to create bright single-photon sources. The emission from the developed quantum devices is studied by means of photon autocorrelation measurements. Furthermore, we explore the prospects of interfacing the QD single photons with a vapor-based quantum memory by employing a ladder-type EIT configuration that allows for low-noise storage and retrieval at high repetition rates.