I find the assumption that any advanced civilization is going to emit external electromagnetic radiation and/or be warm quite curious. Most quantum computing work is at low temperatures, and work on photonics (for example : http://science.sciencemag.org/content/361/6397/57 )is coming along nicely. If we assume an extropian approach of uploading into a more advanced substrate, I find it more likely that they would be quite cold in nature.