News for hackers. Stuff that matters.

A comment on Magnon-based computation could signal computing paradigm shift. Parent comment

Re:Magnon-based computation could signal computing paradigm ... by Aardwolf on Sunday April 02, 2023 @09:48AM (#35410438)
How do you deal with all the output "garbage" signals that reversible computing produces? Do they all get sent somewhere, and the place where they get sent to discards them but heats up?
[ Parent | on HN ]
Re:Magnon-based computation could signal computing paradigm ... by User23 on Sunday April 02, 2023 @11:41AM (#35411713)
From my recollection of the Feynman lectures on the subject, basically yes. Nevertheless the overall theoretical efficiency is still considerably higher than an irreversible machine.

It’s not an area where I’ve followed the subsequent research though. I’d be delighted if someone who knows more chimed in. There are also some obvious advantages for being able to choose precisely when you do a reset and generate your waste heat.

[ Parent | on HN ]
Re:Magnon-based computation could signal computing paradigm ... by nextaccountic on Sunday April 02, 2023 @02:51PM (#35413845)
Being able to choose where you want do dissipate heat would be a game changer in itself
[ Parent | on HN ]
Re:Magnon-based computation could signal computing paradigm ... by sudosysgen on Sunday April 02, 2023 @03:35PM (#35414247)
The garbage output signals get recycled indefinitely. Only the useful output ever needs to generate heat.

It was thought for some time that they needed be turned to heat, but that's actually untrue. Using quantum gates, it is possible to do an arbitrary classical computation and recycle the anciliary bits.

[ Parent | on HN ]
Re:Magnon-based computation could signal computing paradigm ... by dmlerner on Sunday April 02, 2023 @10:04PM (#35417673)
Neat! Any reference you could share for me to read more?
[ Parent | on HN ]
Re:Magnon-based computation could signal computing paradigm ... by sudosysgen on Monday April 03, 2023 @11:59AM (#35426057)
There is a short but sufficient Wikipedia article on it - it is called uncomputation : https://en.wikipedia.org/wiki/Uncomputation?wprov=sfla1

The textbook I used in my quantum computing class dealt with the subject far better, but unfortunately it's not public yet :/

[ Parent | on HN ]