On 8 August 2014 09:11, Bruno Marchal <[email protected]> wrote: > > You are on Earth, and you need, for some reason, to go urgently on Mars. > Bad luck, you can't really afford the 100% secure quantum classical > teleportation channel Earth-Mars, but you have enough money to take a > channel where it is known that the probability of eavesdropping is 1/4. > > Now there will be two questions, according to the fact that > the eavesdropping is destructive, or not. > > The eavesdropping is destructive when Eve, the "pirate", intercepts the > message, and prevents it to attain Mars. > The eavesdropping is non-destructive when Eve intercepts the message, > copies it, and let it attain Mars. > > In both question the probability of eavesdropping is 1/4, and it is > supposed that Eve reconstitutes you in Hell, or some bad place. > > You are on Earth, just before pushing the button. How do you evaluate your > chance to find yourself in hell? > > a) with a destructive eavesdropping? >
This is surely 1 in 4. 1 out of 4 times your message is intercepted and reconstituted in Hell. So 1 in 4 times you go to Hell. > > b) with a non-destructive eavesdropping? > > 1 in 4 times your message is intercepted, and on that occasion there is a 50-50 chance to find yourself in Hell. So there is a 1 in 4 chance of interception, and half that of ending in Hell, so 1 in 8. (This is assuming that your are digitally emulable, of course. Otherwise teleportation will destroy you, so the chances are 0 in each case.) -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
