>>10826771communication (across AU distances), encryption, protecting species and genetic diversity (if that becomes an issue humans care about or animals become rare)
it also offers an opportunity to test classic sci fi tropes of FTL. in this case information will travel faster than light, since you are entangling something, separating it, then causing perturbations in the spin-states of the entangled something through observations, yielding information. all human knowledge is electrical signals so you just need an on off switch to retrofit everything in the world that we use to now exploit this quantum effect and allow for cheaper and more efficient gadgets.
i make two quantum phones and send you one, i can talk to you through it, but there is no travel time through space for my message since i am not really talking to you, i am modifying something you are holding by modifying something i am holding. for it to really 'work' we would need perfect fidelity.
eg. build a regular computer synthesizer for my voice, face, etc. then i am just sending instructions to your local digital puppet of me through entangled spin states of subatomic particles. it'll be some little tube or capsule in your device which a laser shines on and integrates the signals it detects into the rest of the circuitry that makes the whole thing work.
