I think to the best of my knowledge that in teleporatation when one grabs the quantum information from the original location one destroys the physical content from the original location, then transmits the information to the second location, and rebuilds the original physical content. In other words the original physical content is destroyed in the act of analyzing the content. So there is not a danger of leaving a "copy of oneself" at the original location. Necessarily to measure quantum spin and so on, the original physical material is destroyed, or more precisely, is re-arranged into indecipherable form.
One question. If you know the exact location of all the particles as you do this, and you "teleport" them, but at the same time create a copy in the old location with the same quantum information, aren't you back to the same problem?
Had not thought about that. I suppose once one has all the quantum information one needs, one could "splice the signal" into an arbitrary amount of copies. Unless there was some entanglement going on. That is, if Origin Point and Destination Point where put into some kind of EPR entangled state to preclude both points having a "copy" at the same time.
