On 19 Jun 2017, at 19:08, Brent Meeker wrote:
On 6/19/2017 2:46 AM, Bruno Marchal wrote:
So back to quantum computation: what I think that QC demonstrates
(independently of it being realised by network models or cluster
states) is that the superposition of states really does mean that
the
various states *exist*.
Superposition of states just means you choose a basis for the
states that did not have the right eigenstates. "Being in a
superpostion" is just a coordinate choice. It's like saying that
going from Bermuda to London is a superposition of north-traveling
and east-traveling.
? That resembles a confusion between pure state and mixed state.
I didn't say anything about mixed states. I pointed out that any
pure state can be expressed as a superposition by writing it in
basis other than its eigenbasis. This is not unique so which states
appear in the superposition is matter of choice. That makes it hard
to regard them as existing.
I agree it is conceptually hard, but it is logically simple.
I am sure you are aware of the difference so I find this answer
very weird. It brushes away all the interpretation problem we have
of the facts (not just the theory). Single photon (or molecule)
interference would not exist if pure state where not also
superposition in the rotated base.
Why would you say that if I fly from Bermuda to London it
demonstrates that flights from Bermuda to Algiers and Algiers to
London exist?
Why should I not when I can find interference pattern involving
Algiers and some other city? It is the interference which forces us to
take "the two slit" into account, even with only one photon used in
the process?
Bruno
Brent
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