Highly Indistinguishable Single Photons from Droplet-Etched GaAs Quantum Dots Integrated in Single-Mode Waveguides and Beamsplitters
Sprache des Titels:
Englisch
Original Kurzfassung:
Integration of on-demand quantum emitters into photonic
integrated circuits (PICs) has drawn much attention in recent years, as it
promises a scalable implementation of quantum information schemes. A
central property for several applications is the indistinguishability of the
emitted photons. In this regard, GaAs quantum dots (QDs) obtained by
droplet etching epitaxy show excellent performances, making the realization
of these QDs into PICs highly appealing. Here, we show the first
implementation in this direction, realizing the key passive elements needed
in PICs, i.e., single-mode waveguides (WGs) with integrated GaAs-QDs and
beamsplitters. We study the statistical distribution of wavelength, linewidth,
and decay time of the excitonic line, as well as the quantum optical properties
of individual emitters under resonant excitation. We achieve single-photon purities as high as 1 ? g(2)(0) = 0.929 ± 0.009 and twophoton
interference visibilities of up to VTPI = 0.953 ± 0.032 for consecutively emitted photons.
Forschungs-