title: Information transmission without energy exchange.
abstract: We show that it is possible to use a massless field in the vacuum to communicate in such a way that the signal travels arbitrarily slower than the speed of light and such that no energy is transmitted from the sender to the receiver. Instead, the receiver has to supply a signal-dependent amount of work to switch his detector on and off. This type of communication is related to Casimir-like interactions, and it is made possible by dimension-and curvature-dependent subtleties of Huygens' principle.
authors.affiliation: Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Robert H
authors.initials: RH
authors.lastname: Jonsson
authors.affiliation: Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.|Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.|Perimeter Institute for Theoretical Physics, 31 Caroline Street N, Waterloo, Ontario N2L 2Y5, Canada.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Martín-Martínez
authors.affiliation: Department of Applied Mathematics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.|Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.|Perimeter Institute for Theoretical Physics, 31 Caroline Street N, Waterloo, Ontario N2L 2Y5, Canada.
authors.forename: Achim
authors.initials: A
authors.lastname: Kempf