Quantum Optics Seminar by Leonardo Midolo – Niels Bohr Institute - University of Copenhagen

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Quantum Optics Seminar by Leonardo Midolo

The controlled generation of single photons within a semiconductor chip is a key requirement for the realization of photonic integrated circuits operating at the quantum level. Semiconductor quantum dots (QDs) coupled to photonics crystal cavities (PCCs) have been widely employed as efficient and scalable single photon sources. Unfortunately, the spectral properties of PCCs are extremely sensitive to small fabrication imperfections and ageing effects. This makes the precise control of their resonant wavelength a very demanding task and necessitates a tunable architecture. We demonstrate an electro-mechanically tunable cavity based on evanescently coupled slab waveguides [1,2] to align the modes of a PCC to single excitonic lines. We present the operation of the device at low temperatures (<10 K) and we measured the Purcell effect via the electro-mechanical control. A reversible tuning range of 13 nm and a spontaneous emission rate control by a factor of ten has been achieved, opening the way to scalable, fully-controlled single photon sources for integrated quantum networks [3].