QUICK3$^3$ ‐ Design of a Satellite‐Based Quantum Light Source for Quantum Communication and Extended Physical Theory Tests in Space

• Published in: Advanced quantum technologies (Online) 2024-04, Vol.7 (4), p.n/a
• Main Authors: Ahmadi, Najme, Schwertfeger, Sven, Werner, Philipp, Wiese, Lukas, Lester, Joseph, Da Ros, Elisa, Krause, Josefine, Ritter, Sebastian, Abasifard, Mostafa, Cholsuk, Chanaprom, Krämer, Ria G., Atzeni, Simone, Gündoğan, Mustafa, Sachidananda, Subash, Pardo, Daniel, Nolte, Stefan, Lohrmann, Alexander, Ling, Alexander, Bartholomäus, Julian, Corrielli, Giacomo, Krutzik, Markus, Vogl, Tobias
• Format: Article
• Language: English
• Subjects: fundamental quantum science; quantum key distribution; single photons; space quantum technology
• ISSN: 2511-9044; 2511-9044
• DOI: 10.1002/qute.202300343

Modern quantum technologies have matured such that they can now be used in space applications, e.g., long‐distance quantum communication. Here, the design of a compact true single photon source is presented that can enhance the secure data rates in satellite‐based quantum key distribution scenarios compared to conventional laser‐based light sources. The quantum light source is a fluorescent color center in hexagonal boron nitride. The emitter is off‐resonantly excited by a diode laser and directly coupled to an integrated photonic processor that routes the photons to different experiments performed directly on‐chip: i) the characterization of the single photon source and ii) testing a fundamental postulate of quantum mechanics, namely the relation of the probability density and the wave function (known as Born's rule). The described payload is currently being integrated into a 3U CubeSat and scheduled to launch in 2024 into low Earth orbit. Therefore the feasibility of true single photon sources and reconfigurable photonic circuits in space can be evaluated. This provides a promising route toward a high‐speed quantum network. Quantum communication is limited due to the need to generate single photon states and the transmission of these over long distances. The design and space‐qualification of a single photon source compatible with nanosatellites in the QUICK3 mission are presented. The light source can enhance the data rates of quantum communication links as well as simplifies the complexity of a satellite.