  Quantum key distribution (QKD), provides the only intrinsically unconditional
secure method for communication based on principle of quantum mechanics.
Compared with fiber-based demonstrations-, free-space links could provide the
most appealing solution for much larger distance. Despite of significant
efforts, so far all realizations rely on stationary sites. Justifications are
therefore extremely crucial for applications via a typical Low Earth Orbit
Satellite (LEOS). To achieve direct and full-scale verifications, we
demonstrate here three independent experiments with a decoy-state QKD system
overcoming all the demanding conditions. The system is operated in a moving
platform through a turntable, a floating platform through a hot-air balloon,
and a huge loss channel, respectively, for substantiating performances under
rapid motion, attitude change, vibration, random movement of satellites and in
high-loss regime. The experiments cover expanded ranges for all the leading
parameters of LEOS. Our results pave the way towards ground-satellite QKD and
global quantum communication network.
