Concerted efforts are underway to establish an infrastructure for a global quantum Internet to
realise a spectrum of quantum technologies. This will enable more precise sensors, secure …

Data receiving frontends using avalanche photodiodes are used in optical free-space
communications for their effective sensitivity, large detection area, and uncomplex operation …

Abstract Models of quantum systems on curved space-times lack sufficient experimental
verification. Some speculative theories suggest that quantum correlations, such as …

Small satellite launch opportunities are rapidly expanding and technical capabilities are
improving. Several commercial constellations of small satellites for Earth observation and …

Future Earth Observation satellite data downlinks via directed laser beams are a promising
technique to overcome the data repatriation bottleneck in high resolution sensor missions. A …

Small satellite technical capabilities continue to grow and launch opportunities are rapidly
expanding. Several commercial constellations of small satellites for Earth observation and …

As Optical Low Earth Orbit Downlinks (OLEODL) serve for sensor data download from earth
observation satellites, their link scenario is strongly asymmetric, since the data flow is mostly …

A portable optical ground station can track a satellite with an amateur telescope mounted on
a two-axis gimbal. The telescope is aligned with respect to an inertial, Earth-fixed frame …

Optical Direct-to-Ground data links for earth-observation satellites will offer channel rates of
several Gbps, together with low transmit powers and small terminal mass and also rather …

Quantum key distribution (QKD) is one of the most mature quantum technologies and can
provide quantum-safe security in future communication networks. Since QKD in fiber is …