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AssigneeKøbenhavns Universitet
InventorsPeter Lodahl, Chris Lennart Dreessen, Petru Tighineanu, Anders Søndberg Sørensen, Leonardo Midolo
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The invention relates to coherent single photon sources that provide photons with a high degree of indistinguishability. It is a disadvantage of single photon sources based on QDs in nanophotonic structures that, even at low temperatures, acoustic vibrations interact with the QDs to reduce the coherence of the emitted spectrum. The invention uses mechanical clamping of the nanostructure to damp vibrations leading to a weaker QD—phonon coupling and a higher degree of indistinguishability between successively emitted photons. The clamp is mechanically connected to the length of the photonic nanostructure and has a stiffness and a size sufficient to suppress low frequency vibrations (ω≤10 GHz) in a combined structure of the clamp and the nanostructure.
A coherent single photon source with wavelength λ, comprising an elongated, semiconductor photonic nanostructure and a self-assembled quantum dot positioned inside the photonic nanostructure, wherein the photonic nanostructure has a cross-sectional area smaller than 2 μm2, wherein the single photon source further comprises an elongated clamp formed in a material that is transparent and has a refractive index smaller than 2 at the wavelength λ, and, wherein the clamp is mechanically connected to the length of the photonic nanostructure and has a stiffness and a size sufficient to suppress low frequency vibrations (ω≤10 GHz) in a combined structure of the clamp and the nanostructure.
A method for improving the indistinguishability of a single photon source having an elongated, semiconductor photonic nanostructure and a self-assembled quantum dot positioned inside the photonic nanostructure, wherein the photonic nanostructure has a cross-sectional area smaller than 2 μm2, the method comprising:
Dependencies are inferred from the claim text.