Quantum entangled-photon Chinese satellite.

[Mirimir]

>From <https://en.wikipedia.org/wiki/Faster-than-light#Quantum_mechanics>:

> Certain phenomena in quantum mechanics, such as quantum entanglement,
> might give the superficial impression of allowing communication of
> information faster than light. _According to the no-communication
> theorem these phenomena do not allow true communication; they only
> let two observers in different locations see the same system
> simultaneously, without any way of controlling what either sees._
> Wavefunction collapse can be viewed as an epiphenomenon of quantum
> decoherence, which in turn is nothing more than an effect of the
> underlying local time evolution of the wavefunction of a system
> and all of its environment. Since the underlying behaviour
> doesn't violate local causality or allow FTL it follows that
> neither does the additional effect of wavefunction collapse,
> whether real or apparent.

(emphasis added)