Quantum optics with semiconductor nanostructures - Towards deterministic sources for quantum communication networks

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• Stephan Reitzenstein (Technische Universitat, Berlin)
• Monday 24 November 2014, 15:30-17:00
• Mott Seminar Room (531), Cavendish Laboratory, Department of Physics.

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The emerging field of quantum optics in semiconductor nanostructures has benefited enormously from the excellent optical properties of self-assembled quantum dots (QDs). Acting as high quality photon emitters, they have paved the way for single photon sources, and sources of entangled photon pairs [1]. Recently, they allowed for the observation of spin-photon entanglement and quantum teleportation which are key results for future quantum communication networks. In this talk, I will report on our recent developments in the deterministic fabrication of single QD quantum devices and on the realizationof coupledcQED systems. In particular, anin-situ electron beam lithography approach will be presented which allows us to precisely pattern photononic nanostructures which are aligned to preregisteredQDsinorder to boost their photon extraction efficiency in deterministic quantum light sources [2, 3]. Beyond the realization of single nanophotonics structures Iwill also present a novel scheme for fully integrated on-chip quantum optics. Here, we use for the first time an integrated electrically driven QD-microlaser to resonantly excite a coupled QD-microcavity system operating in the weak coupling regime [4]. This concept can pave the way for compact integrated sources of single photons and entangled photon pairs. [1] A. Shields, Nat. Photonics1, 215 -223 (2007) Gschrey et al., Appl. Phys. Lett.102, 251113 (2013) Gschrey et al., arXiv:1312.6298(2013) Stock et al., Adv. Mat.25, 707 (2013)

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