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HL: Fachverband Halbleiterphysik

HL 51: Focus Session: Hybrid Quantum-Dot / Atom Systems

HL 51.6: Hauptvortrag

Mittwoch, 22. März 2017, 11:45–12:15, POT 112

Atomic-vapor-enabled variable optical delay for triggered single-photons from a semiconductor quantum dot — •Hüseyin Vural¹, Jonas Weber¹, Markus Müller¹, Simon Kern¹, Julian Maisch¹, Matthias Widmann², Robert Löw³, Jörg Wrachtrup², Ilja Gerhardt², Simone Portalupi¹, Michael Jetter¹, and Peter Michler¹ — ¹Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — ²3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart — ³5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart

Beside their enormous flux, quantum dots (QDs) allow for high photon indistinguishability and photonic entanglement generation, and their use as flying qubits for the quantum communication of the future. One limitation of QDs is the missing long lasting quantum memory. Here, we focus on the approach of storing light in an cesium (Cs)-vapor by slowing down single photons. High dispersion between ground-state hyperfine resonances of Cs-vapors enables lower group velocities, while maintaining transmission. Using a Cs-vapor as slow light-medium, we present a variable delay up to several ns for photons from resonantly excited QD's. Increasing the temperature in the vapor changes the dispersion, which allows us to control the amount of delay experienced by the photons. Eventually we investigate and compare the single-photon emission and two-photon interference of delayed and undelayed photons.