Dear scenir,
Thank you for reminding me to read that paper! It has been in my stack
for about a year.
I have been a long advocate that contextuality is very important in
physics and must be taken into account within any "realist" philosophy.
Whether contextuality manifests in terms of an environment within which
decoherence of a QM system's entanglement obtains or some notion of an
observer or some idea (that I am searching for) that spans between these, it
must no be neglected.
One of the best experiments that needs to be considered with regard to
contextuality is the "quantum eraser":
http://grad.physics.sunysb.edu/~amarch/Walborn.pdf
Kindest regards,
Stephen
----- Original Message -----
From: "scerir" <scerir.domain.name.hidden>
To: "Stephen Paul King" <stephenk1.domain.name.hidden>;
<everything-list.domain.name.hidden>
Sent: Friday, July 15, 2005 4:05 PM
Subject: Re: Noncommutability of observables
>> Any ideas on the 3rd person aspect?
>> Are you assuming that that commutability
>> or non-commutativity of observables
>> is fixed a priori?
>> Stephen
>
> There are problems about consistency between
> measurements on the same system
> http://www.arxiv.org/abs/quant-ph/0107151
> and related commutativity/non commutativity
> between density matrices.
>
> More than this, our usual assumption that the result
> of the measurement of a certain operator A
> depends _only_ on the state of the quantum system
> we are measuring, and nothing else,
> is flawed ((in general, not when the state
> of the quantum system is an eigenstate
> of the operator A). There is contextuality.
>
> Saluti,
> s.
Received on Fri Jul 15 2005 - 20:36:33 PDT