SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 37: Materials and devices for quantum technology II

HL 37.5: Talk

Thursday, March 30, 2023, 10:30–10:45, JAN 0027

Prospects for electrically controlled, directly fiber-coupled circular Bragg gratings as high performance quantum light sources — •Lucas Rickert¹, Fridtjof Betz², Matthias Plock², Sven Burger^2,3, and Tobias Heindel¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany — ²Zuse Institute Berlin, Takustraße 7, 14195 Berlin, Germany — ³JCMwave GmbH, Bolivarallee 22, 14050 Berlin, Germany

Semiconductor quantum dots in (hybrid) circular Bragg gratings (hCBGs) have shown seminal performances as bright sources of indistinguishable entangled photons at wavelengths below 900 nm and have also shown significant boosts in performances for telecom wavelength single photons sources. To fully harness their potential for photonic quantum technologies, a direct coupling to single mode fibers (SMFs) for robust quantum light sources as well as designs with gate-contacts allowing for electrical control of the embedded emitters charge environment and spectral Stark-tuning is desirable. In this contribution, we present hCBG-based designs enabling electrical control, which are numerically optimized to show >85% direct fiber coupling efficiencies to SMFs, and Purcell enhancements >20 at operation wavelengths for 930 nm, 1310 nm and 1550 nm respectively. We investigated extensively the impact on performance of deviations in the fabrication using machine-learning algorithms, and show our recent progress in the experimental realization of directly fiber-coupled hCBG single photon sources.