Time reversed encryption

Time reversal frameness and superselection

Authors: Gilad Gour, Barry C. Sanders, Peter S. Turner
(Submitted on 24 Nov 2008)
Abstract: We show that appropriate superpositions of motional states are a reference frame resource that enables breaking of time-reversal superselection so that two parties lacking knowledge about the other's direction of time can still communicate. We identify the time-reversal reference frame resource states and determine the corresponding frameness monotone, which connects time-reversal frameness to entanglement. In contradistinction to other studies of reference frame quantum resources, this is the first analysis that involves an antiunitary rather than unitary representation.