X-Message-Number: 20297
From: 
Date: Sun, 13 Oct 2002 10:08:28 EDT
Subject: Re: CryoNet #20281 Quantum computer

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From Mark Plus:

> 
> >Is it true that a quantum computer is working on your particular problem
> >even if you observe it to be turned "off" in your universe, because the
> >computer is "on" & running your program in parallel ones?
> 
> 

Yea! In fact, this has nothing to do with parallel universes, it is about 
multilinearity of quantum space. 

Now beyond "ordinary" QC, there may be a stranger breed using time loops. I 
don't think time loops are a physical reality, but time blurring of the 
present could do the same. Another possibility is a QC in the simulated space 
of "black magic". You may look at this on xxx. lanl.gov :

 
\\
Paper: gr-qc/0209061
From: Todd Brun <>
Date: Wed, 18 Sep 2002 18:52:39 GMT   (7kb)

Title: Computers with closed timelike curves can solve hard problems
Authors: Todd A. Brun (Institute for Advanced Study)
Comments: 9 pages LaTeX; submitted to Foundations of Physics Letters
Subj-class: General Relativity and Quantum Cosmology; Computational 
Complexity
\\
  A computer which has access to a closed timelike curve, and can thereby 
send
the results of calculations into its own past, can exploit this to solve
difficult computational problems efficiently. I give a specific demonstration
of this for the problem of factoring large numbers, and argue that a similar
approach can solve NP-complete and PSPACE-complete problems. I discuss the
potential impact of quantum effects on this result.
\\

Y. Bozzonetti.

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