can someone explain algorithmic cooling to me? (i think that's what it's called.) in a work of fiction i am presently reading, an interior space is cooled by a quantum-computational device engaged in ongoing calculations. the book is 'redemption ark' by alastair reynolds and the technology is named (in the book) a 'cryo-arithmetic engine.' i believe i've read something before about how heat ties into whether a computational operation is 'reversible' or not. obviously i have no idea what i'm talking about. i've only read a few layman's books on quantum computing. i just want to know how something like this might work.