|Scientific American: see link "Casimir-like interactions" in 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 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 signalling is related to Casimir-like interactions and it is made possible by dimension ---and curvature--- dependent subtleties of Huygens' principle.
Physics arXiv: Quantum Collect Calling
Robert H. Jonsson, Eduardo Martin-Martinez, Achim Kempf