X-Message-Number: 18528
From: 
Date: Sat, 9 Feb 2002 08:07:46 EST
Subject: Re: Simulation

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From: Henri Kluytmans <>:


> A quantum computer of n qubits can designate the same limited number of 
> states as a conventional computer with a register of n bits. The 
> advantage of a quantum computer is that it can operate on all possible 
> combinations of those n bits in one single operational step!
> 

This recall me the dialogue:
-Snwo is white.
-NO, snow is withe.

>If you have a quantum computer of 813 qubits, and you let it collapse, 
>you will get a number of 813 bits. 
>
>And could you explain to me how that number of 813 bits would tell me 
>which of the 2^813 Planck cubes would be in the "on" state, and which 
>ones would be "off" ?

The problem here is the way you think a quantum computer must be used.
Clearly, you are wired on the factorization problem: here we start with all 
possible combinations and at the end only one is selected. Furthermore, the 
entire computation is collapsed to the classical domain (if there was no 
collapse, we would have at least two states: the "answer state" and the empty 
one). 

Here, in the Universe simulation, no classical collapse is intended, the 
"result" remains in the quantum state as said before (it may be linked to 
another computation round ). So there is not a single word selected, what 
remains is a set of words, each one is an elementary cube  address., 
precisely the addresses in the "on" state.

>Or, to be precise, because the time dimension is to be eliminated,
>(you're looking at "all time") : how can a number of 813 bits 
>tell me which of 10^183 (~2^608) cubes are in the "on" state ????


If the matter density in the simulation is defined so that here are 2^608 
cubes in the "on" state, then the simulation starts with 2^813 states and end 
with 2^608. If you wan you can use a second computation step and reduce this 
to a single state, in classical space, that second round describes a big 
crunch where the universe is compressed into a single point in space and time.

Once more, I must stress this is not the normal fate of a simulation.

Yvan Bozzonetti.


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