[quantum-info] Q+ hangout - Roger Colbeck - Tuesday Jan 29 at 9:00am

Aharon Brodutch cap.fwiffo at gmail.com
Wed Jan 23 21:36:53 EST 2013


There was a mistake on my last email
The date is Jan 29 (next week Tuesday) not Nov 29

Cheers
 Aharon


On Wed, Jan 23, 2013 at 10:24 AM, Aharon Brodutch <cap.fwiffo at gmail.com>wrote:

> Hi all
> For anyone who is interested we will be joining the  q+ Hangout  on
> Tuesday in QNC 3206 at 9am.
>
> -
> Roger Colbeck (ETH Zurich): No extension of quantum theory can have
> improved predictive power
>
> Abstract:
> According to quantum theory, measurements generate random outcomes, in
> stark contrast with classical mechanics.  This raises the important
> question of whether there could exist an extension of the theory which
> removes this indeterminism, as famously suspected by Einstein, Podolsky and
> Rosen.  Under the assumption of free choice within a particular causal
> structure, Bell's work showed this to be impossible.  However, existing
> results do not imply that the current theory is maximally informative.
>  Could it be that certain hidden variable theories (for example) allow us
> to make more accurate predictions about the outcomes?
>
> In this talk, I will discuss this question and show that, under the same
> free choice assumption, the answer is negative:  no extension of quantum
> theory can give more information about the outcomes of future measurements
> than quantum theory itself.
>
> I will then show that as a corollary of this result, we can reach the same
> conclusion as Pusey, Barrett and Rudolph that the wavefunction cannot be
> thought of as subjective.
>
> (This is based on arXiv:1005.5173, arXiv:1111.6597 and arXiv:1208.4123)
> -
> Cheers
>    Aharon
>
>
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