Editing Faster-than-light communication (section)

===Quantum entanglement===
* In [[Ernest Cline]]'s novel ''[[Armada (novel)|Armada]]'', alien invaders possess technology for instant "quantum communication" with unlimited range. Humans reverse engineer the device from captured alien technology.<ref>{{Cite book |url=https://books.google.com/books?isbn=1137584491 |title=The Cyborg Subject: Reality, Consciousness, Parallax |last=Benjamin |first=Garfield |publisher=Palgrave Macmillan |year=2016 |isbn=978-1-137-58448-9 |pages=28}}</ref>
* In the ''[[Mass Effect]]'' series of video games, instantaneous communication is possible using quantum-entanglement communicators placed in the communications rooms of starships.
* In the ''[[Avatar (2009 film)|Avatar]]'' continuity, faster-than-light communication via a subtle control over the state of entangled particles is possible, but for practical purposes extremely slow and expensive: at a transmission rate of three bits of information per hour and a cost of $7,500 per bit, it is used for only the highest priority messages.<ref>''James Cameron's Avatar: An Activist Survival Guide'', p.&nbsp;156–157.</ref>
* [[Charles Stross]]'s books ''[[Singularity Sky]]'' and ''[[Iron Sunrise]]'' make use of "causal channels" which use entangled particles for instantaneous two-way communication. The technique has drawbacks in that the entangled particles are expendable and the use of faster-than-light travel destroys the entanglement, so that one end of the channel must be transported below light speed. This makes them expensive and limits their usefulness somewhat.
* In [[Liu Cixin]]'s novel ''[[The Three-Body Problem (novel)|The Three-Body Problem]]'', the alien Trisolarans, while preparing to invade the Solar System, use a device with Ansible characteristics to communicate with their collaborators on Earth in real time. Additionally, they use spying/sabotaging devices called 'Sophons' on Earth which by penetration can access any kind of electronically saved and visual information, interact with electronics, and communicate results back to Trisolaris in real-time via quantum entanglement. The technology used is "single protons that have been unfolded from eleven space dimensions to two dimensions, programmed, and then refolded" and thus Sophons remain undetectable for humans.