Skip to content

No Femtotech Grey Goo?

June 9, 2007

I recently came across the paper Non Existence of Quantum Mechanical Self Replicating Machine by Chakrabarty and Indranil which builds on Quantum mechanical Universal constructor by Patil and Braunstein.

The paper shows that it is not possible to make a self-replicating quantum mechanical device because of the linearity of quantum mechanics, the no cloning theorems and the conservation of entanglement. The unitariness of quantum mechanics is not very favorable towards replication: a real replicator needs to convert arbitrary states into states corresponding to a copy, but quantum mechanics is information preserving. We need decoherence to replicate. Presumably one could construct an approximative replicator that does not achieve perfect self-replication but only “good enough” replication (the Patil paper shows that one can make a replicator that produces a finite number of generations, and mentions the possibility of indeterministic replicators).

Via Anders Sandberg.

Advertisements

From → Nanotechnology

Leave a Comment

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: