From: Anders Sandberg (asa@nada.kth.se)
Date: Wed Aug 06 2003 - 01:22:08 MDT
On Tue, Aug 05, 2003 at 02:18:34PM -0700, Robert J. Bradbury wrote:
>
> > Wouldn't it be possible to create a quantum computer based on
> > spin-coupling as a communication "backplane"?
>
> Yep, you could propose such a computer. But Robert will jump
> all over your butt for proposing "magic physics" on the ExI list.
> There are a couple of people who have "Get out of jail free"
> cards to do this (Anders & Robin come to mind since they know
> a lot more physics than I do).
Aha, so that was why that little card was lying on my monitor (next to
the "You have won second price in a beauty contest" card I thought was
spam).
Seriously, spin-coupled quantum computers probably make dandy
low-temperature parts of a M-brain. But they are not magical: at best
they have just an exponential speedup for certain problems, and they are
reversible (meaning that they do not dissipate except for bit erasure
and some error correction). I have the feeling (like Robert) that the
original proposal suggested some entanglement communication, and that is
magical physics. If we had such FTL communication, then M-brains could
be designed much more efficiently by keeping remote parts linked, and I
think the analysis of size and movement would become very changed.
Hmm, I just ended up on Boardwalk and somebody built a Chronos there...
-- ----------------------------------------------------------------------- Anders Sandberg Towards Ascension! asa@nada.kth.se http://www.nada.kth.se/~asa/ GCS/M/S/O d++ -p+ c++++ !l u+ e++ m++ s+/+ n--- h+/* f+ g+ w++ t+ r+ !y
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