SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 18: Quantum Dots and Wires (joint session HL/TT)

HL 18.8: Talk

Thursday, September 30, 2021, 15:45–16:00, H4

Interfacing colloidal quantum dots with nanophotonic circuits for integrated single photon sources — •Tobias Spiekermann, Alexander Eich, Helge Gehring, Lisa Sommer, Julian Bankwitz, Wolfram Pernice, and Carsten Schuck — Institute of Physics, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

Single photon sources are a key element for the realization of quantum communication, sensing and computing. While there exist several promising quantum emitter candidate systems, integration with nanophotonic networks in large numbers for wafer-scale quantum technologies has remained elusive. Here we show a lithographic technique that allows for interfacing nanophotonic waveguides with individual Colloidal Quantum Dots (CQD) from a solution applied across an entire chip [1]. We record the second order autocorrelation function to confirm single photon emission from CQDs into tantalum pentoxide (Ta₂O₅) waveguides that feature low intrinsic material fluorescence. Moreover, we demonstrate how iterative processing can be used to increase the yield of single CQDs with our technique. We further improve the photostability of CQDs positioned on a chip by subsequent site-passivation via atomic layer deposition of alumina (Al₂O₃). Our work paves the way for scalable integration of colloidal quantum dot single photon sources with photonic integrated circuits.

[1] Cherie R. Kagan, et al., Colloidal Quantum Dots as Platforms for Quantum Information Science, Chemical Reviews 121 (5), 3186-3233 (2021)