begin quoting Tracy R Reed as of Fri, Nov 18, 2005 at 07:29:14PM -0800: [snip] > > Much simpler to simply generate a one-time pad. Entangled particles > > have to be kept safe from the rest of the universe so they don't > > decohere on you. > > I'm not so concerned about the encryption as I am about just being able > to communicate without relying on physical infrastructure under > government control. ...and so far as we know, you can't jam quantum entanglement. I see.
I'm just wondering about the infrastructure that would be required to create entangled particles, and to keep 'em isolated long enough to be used. Let's say we build a device. It'll hold N bits worth of entangled particles. You'll need a clock so that the device can signal its counterpart every so often to say "I have [no] data" -- which will give it a limited lifetime even if we do solve the decoherence problem. What's a useful lower bound for that lifetime, for your purposes? How much of a delay is acceptable between sending and receiving data? Plus you'd need a device for every person you want to talk to. So the devices will need to be *tiny*. -Stewart "Say... about the size of an ALTOIDS tin?" Stremler -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
