title: Transmission of a Cartesian frame by a quantum system.
abstract: A single quantum system, such as a hydrogen atom, can transmit a Cartesian coordinate frame (three axes). For this it has to be prepared in a superposition of states belonging to different irreducible representations of the rotation group. The algorithm for decoding such a state is presented, and the fidelity of transmission is evaluated.
authors.affiliation: Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Peres
authors.forename: P F
authors.initials: PF
authors.lastname: Scudo