How would you transfer?

The energy of a photon has little to do with its "travel" ability, but it does come into effect for its probability of being absorbed by some sort of matter. You could also use radio waves, or light (laser) or anything like that (microwaves, even).

The key would be to choose something that is not readily absorbed by the stuff that's between you and the target. For example, you wouldn't want to choose something that can be readily absorbed by hydrogen; maybe you'd want to use something lower-frequency, as higher frequencies (gammas) can still eject electrons from the hydrogen, leading to data loss.

How would you do error correction, you can't even get 1 byte there for 2.5 million years even traveling at the speed of light.

Telecom protocols do a lot of handshaking back and forth to verify that a piece of data arrived, arrived once, in order, and unaltered.

Wow pretty nice idea, but since science (so far) says that nothing else travels faster than light then it would be impractical to send data over such long distances since most information would be completely obsolete after 2.5 million years

...but check out this article, its pretty interesting.

http://physicsworld.com/cws/article/print/482