Computer of Pure Light

I always wanted a computer made out of pure light. I mean think of how fast you could run tetris while checking your emails. Supposedly light computers will soon be the way of the future as they are capable of speeding past a normal feeble silicone computer while chucking wheelies and downloading porn mega fast. The only problem is the fact that they have to be kept at close to absolute zero to prevent the light escaping and running around terrorising your neighbour's cat. See below for a fine artists rendition of how the computer might look.