  By harnessing quantum effects, we nowadays can use encryption that is in
principle proven to withstand any conceivable attack. These fascinating quantum
features have been implemented in metropolitan quantum networks around the
world. In order to interconnect such networks over long distances, optical
satellite communication is the method of choice. Standard telecommunication
components allow one to efficiently implement quantum communication by
measuring field quadratures (continuous variables). This opens the possibility
to adapt our Laser Communication Terminals (LCTs) to quantum key distribution
(QKD). First satellite measurement campaigns are currently validating our
approach.
