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The future envisaged global-scale quantum communication network will comprisevarious nodes interconnected via optical fibers or free-space channels,depending on the link distance. The free-space segment of such a network shouldguarantee certain key requirements, such as daytime operation and thecompatibility with the complementary telecom-based fiber infrastructure. Inaddition, space-to-ground links will require the capability of designing lightand compact quantum devices to be placed in orbit. For these reasons,investigating available solutions matching all the above requirements is stillnecessary. Here we present a full prototype for daylight quantum keydistribution at 1550 nm exploiting an integrated silicon-photonics chip asstate encoder. We tested our prototype in the urban area of Padua (Italy) overa 145m-long free-space link, obtaining a quantum bit error rate around 0.5% andan averaged secret key rate of 30 kbps during a whole sunny day (from 11:00 to20:00). The developed chip represents a cost-effective solution for portablefree-space transmitters and a promising resource to design quantum opticalpayloads for future satellite missions.

Full daylight quantum-key-distribution at 1550 nm enabled by integrated silicon photonics