Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 4: Quantum information: Quantum communication I

Q 4.3: Vortrag

Montag, 18. März 2013, 11:30–11:45, F 342

A wavelength tunable quantum light-emitting diode — •Jiaxiang Zhang¹, Fei Ding¹, Eugenio Zallo¹, Santosh Kumar¹, Bianca Höfer¹, Armando Rastelli², Rinaldo Trotta², and Oliver G. Schmidt¹ — ¹Institute for Integrative Nanosciences, IFW-Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany — ²Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria

In an optical quantum network it is desirable to have trigged quantum light sources that emit single photons with exactly the same wavelength. Previous work has realized two photon interference of the emission from two self-assembled quantum dots (QDs). The key is to use giant Stark shift to tune the emissions [Nat. Photon. 4, 632 (2010)]. However the design is cumbersome for the purpose of electrical injection. Here we demonstrate an electrically driven, wavelength tunable singlephoton source utilizing self-assembled InAs/GaAs QDs embedded in a p-i-n light-emitting diode (LED). Triggered single-photon emission is realized by applying ultra-short electrical pulses to the LED, while the wavelength of the emitted single photons is precisely controlled (> 10meV) by external biaxial stresses applied to the LED. We also characterize the decay dynamics of the excitonic states and the pulsed single-photon emission [g2(t)] in this device. Our technique therefore presents strong promise for the realization of two photon interference from separated electrically injected single-photon sources.