Quantum dots for single- and entangled-photon emitters

Dieter Bimberg, Erik Stock, Anatol Lochmann, Andrei Schliwa, Waldemar Unrau, Michael Münnix, Sven Rodt, Askhat Bakarov, Jan A. Töfflinger, Vladimir A. Haisler, Aleksandr I. Toropov, Aleksandr K. Kalagin

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

50 Citas (Scopus)


The efficient generation of polarized single or entangled photons is a crucial requirement for the implementation of quantum key distribution (QKD) systems. Selforganized semiconductor quantum dots (QDs) are capable of emitting one polarized photon or an entangled photon pair at a time using appropriate electrical current injection. We realized a highly efficient single-photon source (SPS) based on well-established semiconductor technology: In a pin structure, a single electron and a single hole are funneled into a single InAs QD using a submicron AlOx current aperture. Efficient radiative recombination leads to emission of single polarized photons with an all-time record purity of the spectrum. Non-classicality of the emitted light without using additional spectral filtering is demonstrated. The out-coupling efficiency and the emission rate are increased by embedding the SPS into a micro-cavity. The design of the micro-cavity is based on detailed modeling to optimize its performance. The resulting resonant single-QD diode is driven at a repetition rate of 1 GHz, exhibiting a second-order correlation function of g(2) (0) = 0. Eventually, QDs grown on (111)-oriented substrates are proposed as a source of entangled photon pairs. Intrinsic symmetry-lowering effects leading to the splitting of the exciton bright states are shown to be absent for this substrate orientation. As a result, the XX → X → 0 recombination cascade of a QD can be used for the generation of entangled photons without further tuning of the fine-structure splitting via QD size and/or shape.

Idioma originalInglés
Número de artículo5075634
Páginas (desde-hasta)58-68
Número de páginas11
PublicaciónIEEE Photonics Journal
EstadoPublicada - jun. 2009
Publicado de forma externa


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