X-Message-Number: 9594
Date: Sat, 2 May 1998 13:37:46 -0400
From: Bozzonetti <>
Subject: Quantum robots

There is an abstract from the Quantum physics server at Los Alamos:

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Paper: quant-ph/9802067
From:  (Paul Benioff - 630-252-3218)
Date: Thu, 26 Feb 1998 19:44:43 GMT   (32kb)

Title: Quantum Robots and Environments
Authors: Paul Benioff(Argonne National Laboratory)
Comments: 30 Latex pages, 3 Postscript figures, submitted to Phys Rev A
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  Quantum robots and their interactions with environments of quantum
systems
are described and their study justified. A quantum robot is a mobile
quantum
system that includes a quantum computer and needed ancillary systems on
board.
Quantum robots carry out tasks whose goals include specified changes in the
state of the environment or carrying out measurements on the environment.
Each
task is a sequence of alternating computation and action phases.
Computation
phase activities include determination of the action to be carried out in
the
next phase and possible recording of information on neighborhood
environmental
system states. Action phase activities include motion of the quantum robot
and
changes of neighborhood environment system states. Models of quantum robots
and
their interactions with environments are described using discrete space and
time. To each task is associated a unitary step operator T that gives the
single time step dynamics. T =3D T_{a}+T_{c} is a sum of action phase and
computation phase step operators. Conditions that T_{a} and T_{c} should
satisfy are given along with a description of the evolution as a sum over
paths
of completed phase input and output states. A simple example of a task
carrying
out a measurement on a very simple environment is analyzed. A decision tree
for
the task is presented and discussed in terms of sums over phase paths. One
sees
that no definite times or durations are associated with the phase steps in
the
tree and that the tree describes the successive phase steps in each path in
the
sum.
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I think this may prove interesting for nanothch amateurs. You can get the
paper  by sending the request: 

get 9802067

in the subject line at: 

Y. Bozzonetti.

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