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Modern quantum technologies have matured such that they can now be used inspace applications, e.g., long-distance quantum communication. Here, we presentthe design of a compact true single photon source that can enhance the securedata rates in satellite-based quantum key distribution scenarios compared toconventional laser-based light sources. Our quantum light source is afluorescent color center in hexagonal boron nitride. The emitter isoff-resonantly excited by a diode laser and directly coupled to an integratedphotonic processor that routes the photons to different experiments performeddirectly on-chip: (i) the characterization of the single photon source and (ii)testing a fundamental postulate of quantum mechanics, namely the relation ofthe probability density and the wave function (known as Born's rule). Thedescribed payload is currently being integrated into a 3U CubeSat and scheduledfor launch in 2024 into low Earth orbit. We can therefore evaluate thefeasibility of true single photon sources and reconfigurable photonic circuitsin space. This provides a promising route toward a high-speed quantum network.

QUICK$^3$ -- Design of a satellite-based quantum light source for quantum communication and extended physical theory tests in space