TECH: Quantum Head Job

From: Smigrodzki, Rafal (SmigrodzkiR@MSX.UPMC.EDU)
Date: Thu Oct 11 2001 - 11:32:18 MDT

Adrian Tymes wrote:

*But*, if you *alter* the shared property, then the alteration also
happens immediately...or so I've been told. Measuring that property
from moment to moment to see if it changed would be the communication
channel in that case. I don't know exactly what the alteration process
is, but it's similar to what goes on in quantum computers, to force
several initially equally likely outcomes to change their
probabilities, until the single correct solution has probability 1 and
everything else has probability 0. (That is, there is some method of
affecting the spin of a particle...)

### Measuring a quantum property invariably changes it - so if you want to
monitor the spin of a single particle, you will actually change it and
destroy the entanglement. You might want to ask the physicists on the list
for a more detailed explanation but the ansible is apparently not compatible
with quantum mechanics as we know it.

Rafal Smigrodzki, MD-PhD

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