Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 39: Focus Session: Quantum Nanophotonics in Solid State Systems I (joint session HL/TT)

TT 39.4: Talk

Tuesday, March 13, 2018, 10:45–11:00, EW 201

Deterministic integration of QDs into on-chip multimode interference couplers via in-situ electron beam lithography — •Peter Schnauber¹, Johannes Schall¹, Samir Bounouar¹, Jin-Dong Song², Theresa Hoehne³, Sven Burger³, Tobias Heindel¹, Sven Rodt¹, and Stephan Reitzenstein¹ — ¹Institut fuer Festkoerperphysik, Technische Universitaet Berlin, Berlin, Germany — ²Korea Institute of Science and Technology, Seoul, Korea — ³Zuse Institut Berlin, Freie Universitaet Berlin, Berlin, Germany

The deterministic integration of quantum emitters into on-chip photonic elements is crucial for the implementation of scalable on-chip quantum circuits. Recent activities include multistep-lithography[1] as well as AFM tip transfer[2]. Here we report on the deterministic integration of single QDs into on-chip beam splitters using single step in-situ electron beam lithography[3]. In order to realize 50/50 coupling elements acting as central building blocks of on-chip quantum circuits we chose tapered multimode interference (MMI) splitters which feature relaxed fabrication tolerances and robust 50/50 splitting ratio. We demonstrate the functionality of the deterministic QD-waveguide structures by µPL spectroscopy and photon cross-correlation between the two MMI output ports. The latter confirms single-photon emission and on-chip splitting associated with g⁽²⁾(0) < 0.5.
[1] Coles et al., Nature Communications 7, 11183 (2016)

[2] Zadeh et al., Nano Letters 16, 2289 (2016)

[3] Gschrey et al., Nature Communications 6, 7662 (2015)