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 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?
Brent
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