Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Focussed Session: Quantum Nanophotonics in Solid State Systems: Status, Challenges and Perspectives II (joint session HL/TT)

HL 25.7: Hauptvortrag

Mittwoch, 14. März 2018, 11:30–12:00, EW 201

Exploiting the Bright and the Dark Side of Deterministic Solid-State Quantum-Light Sources — •Tobias Heindel — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany

Quantum-light sources are key building blocks for future photonic technologies with applications in the fields of quantum communication, quantum computation and quantum metrology.
Here, we will review recent experiments exploiting quantum-light sources based on photonic microlenses deterministically fabricated above pre-selected semiconductor quantum dots (QDs). The first part of the talk will focus on experiments demonstrating the efficient, triggered generation of photon twins - a light state comprised of two temporally correlated photons degenerate in energy and polarization [1]. For this purpose, we select QDs whose exciton finestructure splitting equals the biexciton binding energy Δ E_FSS=|E_bin^XX|. In the second part, we demonstrate that we can exploit photonic QD microlenses to all-optically access the dark exciton (DE) state [2]. By clearly observing the quantum beats of the DE spin-eigenstates |↑⇑±↓⇓⟩, we provide evidence for the robustness of the DE as a long-lived coherent spin-qubit and pave the way towards its wider application. Finally, we briefly discuss prospects of QD-based quantum-light sources for the realization of quantum-secured communication networks.
T. Heindel et al., Nature Communications 8, 14870 (2017)
T. Heindel et al., APL Photonics 2, 121303 (2017)