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I am building an SF universe. While it is very similar to ours, but casual FTL exists. I don't think Lorentz transformations shouldn't work at all, but rather extra dimensions can somehow circumvent them. One kind of FTL is direct communication through entanglement.
There can be two version of it. (Actually i plan two story arc. In the first, humans find much more advanced alien tech, that allows a rapid technological jump, that turns the fate of the whole solar system.)
In the first version, measurement breaks entanglement, but its possible to extract useful data without directly compare measurements on both sides. In the second, it is possible to communicate without depleting the set of entangled pairs, but it still has constraints like a hyperspace jump, or somekind of enemy countermeasure can break entanglement, so it isn't a good idea to rely on FTL droning (which is pretty much fun killer).
So what could be the implications of the first version of entaglement based communication?
Due to its serious limits, common people on Earth couldn't just chit-chat with people on Mars without delay times.
I think the use of it has to be restricted to very urgent, important messages. They couldn't possibly tap into it unless they directly hack the endpoints.
It can be also used to swap encryption keys. I guess even though quantum computers could crack present day encryptions fast, but they still don't have infinite calculating power, so its possible to swap so large encryption keys, that even traditional radio communication can be safe.
An interesting application would be quantum radar, send out entangled photons, keep their pairs in the radar, and notice they change, when the emitted photons hit something.
https://www.popularmechanics.com/military/a28818232/quantum-radar/(I am not sure how it actually works, theese kind of articles tend to extrapolate things, i don't intend to say it relies on FTL signaling, still, it inspired me. And in my universe, a quantum radar could really rely on FTL stuff.)
Would that mean that stealth aircraft would lose its significance? (Although simply detect something isn't the same as getting exact coordinates, or guide a missile to it.)
In space we can already say no stealth unless something can mask all heat emission, which is practically impossible with ignited rockets. That hypothetical quantum radar is still an active sensor, so it isn't that hard to locate and destroy them with directed energy (laser, EMP) weapons. That quantum radar don't ignore background, so celestial bodies still offer the possibility of stealth, hide.
What can be other issues, that i missed?
There can be two version of it. (Actually i plan two story arc. In the first, humans find much more advanced alien tech, that allows a rapid technological jump, that turns the fate of the whole solar system.)
In the first version, measurement breaks entanglement, but its possible to extract useful data without directly compare measurements on both sides. In the second, it is possible to communicate without depleting the set of entangled pairs, but it still has constraints like a hyperspace jump, or somekind of enemy countermeasure can break entanglement, so it isn't a good idea to rely on FTL droning (which is pretty much fun killer).
So what could be the implications of the first version of entaglement based communication?
Due to its serious limits, common people on Earth couldn't just chit-chat with people on Mars without delay times.
I think the use of it has to be restricted to very urgent, important messages. They couldn't possibly tap into it unless they directly hack the endpoints.
It can be also used to swap encryption keys. I guess even though quantum computers could crack present day encryptions fast, but they still don't have infinite calculating power, so its possible to swap so large encryption keys, that even traditional radio communication can be safe.
An interesting application would be quantum radar, send out entangled photons, keep their pairs in the radar, and notice they change, when the emitted photons hit something.
https://www.popularmechanics.com/military/a28818232/quantum-radar/(I am not sure how it actually works, theese kind of articles tend to extrapolate things, i don't intend to say it relies on FTL signaling, still, it inspired me. And in my universe, a quantum radar could really rely on FTL stuff.)
Would that mean that stealth aircraft would lose its significance? (Although simply detect something isn't the same as getting exact coordinates, or guide a missile to it.)
In space we can already say no stealth unless something can mask all heat emission, which is practically impossible with ignited rockets. That hypothetical quantum radar is still an active sensor, so it isn't that hard to locate and destroy them with directed energy (laser, EMP) weapons. That quantum radar don't ignore background, so celestial bodies still offer the possibility of stealth, hide.
What can be other issues, that i missed?