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Home Jack Sarfatti's Blog Adrian Kent, Cavendish Lab "summons" quantum spirits. #2 11-6-11

On Nov 6, 2011, at 1:04 PM, *Paul Zielinski wrote:He claims that his "non-summoning" theorem follows from the no-cloning theorem and and the no-signaling principle, and that it fundamentally distinguishes relativistic QFT from both non-relativistic QM and classical relativity.*

Yes, I know that much. Can you clearly explain what "summoning" means operationally and how it is important for any practical application?

I plan to look through Kent's papers - some of the titles are intriguing.

I agree it's important to distinguish no-cloning from no signaling. No-cloning is sufficient for no-signaling, but not necessary.

No-cloning was only for Nick Herbert's laser amplifier approach to signal non-locality.

The basic error of all the no-signalers seems to be the denial of distinguishablilty of non-orthogonal states. This is manifestly false in my opinion. Glauber coherent states are the counter-example.

"We suppose that both parties have arbitrarily efficient technology,

non-physical

structure and physical theory. In particular, to simplify the discussion initially, we suppose that Alice

and Bob can independently and securely access any relevant point in space-time and instantaneously

process and exchange information there.

non-physical

communications and measurements are error-free and have unbounded precision and capacity. We will

relax these idealized and somewhat unphysical assumptions later."

Yes, I saw that when I skimmed it first time round. Does he actually talk about a realistic case in that paper? I don't think so.

It would help if he, at the beginning ,gave a motive - value added of what "summoning" really means?

Category: MyBlog

Written by Jack Sarfatti

Published on Sunday, 06 November 2011 13:39

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