Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 47: Quantum dots and wires: Optical properties II
HL 47.4: Vortrag
Freitag, 5. April 2019, 10:15–10:30, H34
Generation of single-photon and two-photon pulses from a quantum two-level system — •Katarina Boos1, Lukas Hanschke1, Kevin Andrew Fischer2, Jakob Wierzbowski1, Stefan Appel1, Daniil Lukin2, Shuo Sun2, Rahul Trivedi2, Malte Kremser1, Tobias Simmet1, Constantin Dory2, Jelena Vuckovic2, Jonathan Finley1, and Kai Müller1 — 1Walter Schottky Institut and Physik Department, Technische Universität München, 85748 Garching, Germany — 2E.L. Ginzton Laboratory, Stanford University, Stanford, CA 94306, USA
Resonantly driven quantum two-level transitions in quantum dots are promising single-photon sources [1]. Here, we demonstrate that they can surprisingly also operate in a two-photon bundling regime. Specifically, when exciting with a 2pi pulse emission of a photon during the presence of the laser pulse restarts the Rabi oscillation and leads to a second emission of a photon with near-unity probability [2,3]. Finally, we demonstrate single-photon generation from self-assembled quantum dots with ultra-low multi-photon probability. Using two-photon excitation of the bi-exciton suppresses the re-excitation and improves the single photon purity by several orders of magnitude for short pulses [4].
[1] K. A. Fischer, et al., New J. Phys. 18, 113053 (2016)
[2] K. A. Fischer, et al., Nature Physics 13, 649-654 (2017)
[3] K. A. Fischer, et al., Quantum Sci. Technol. 3, 014006 (2017)
[4] L. Hanschke, et al., npj Quantum Information 4, 43 (2018)