1210.0913 (Patrick Hayden et al.)

Summoning Information in Spacetime, or Where and When Can a Qubit Be?    [PDF]

Patrick Hayden, Alex May

If information is localized near a point, it should be possible in principle to quickly exhibit that information nearby. Building on this notion of localization, we characterize the propagation of quantum information through spacetime by giving a simple description of all the situations in which that information can be summoned to a set of spacetime points. The answer depends only the various causal relationships between the points at which the challenges occur and the points at which the information must be produced. In general, whenever summoning is possible, it can be achieved using a combination of quantum error correction and teleportation.

View original: http://arxiv.org/abs/1210.0913