[quantum-info] Fwd: Q+ hangout: Caslav Brukner, July 24 @ 9am, RAC1 1101

[Marco Piani]

Begin forwarded message:

> From: Marco Piani <mpiani at connect.uwaterloo.ca>
> Date: July 20, 2012 12:04:18 PM EDT
> To: IQC Member List <IQCmembers at iqc.ca>
> Subject: Q+ hangout: Caslav Brukner, July 24 @ 9am, RAC1 1101
>
> IQC, RAC1 1101
> Tuesday, July 24
> 9:00am
>
> Caslav Brukner, University of Vienna
>
> Title: Quantum correlations with indefinite causal order
>
> Abstract: In quantum physics it is standardly assumed that the  
> background time or definite causal structure exists such that every  
> operation is either in the future, in the past or space-like  
> separated from any other operation. Consequently, the correlations  
> between operations respect definite causal order: they are either  
> signalling correlations for the time-like or no-signalling  
> correlations for the space-like separated operations. We develop a  
> framework that assumes only that operations in local laboratories  
> are described by quantum mechanics (i.e. are completely-positive  
> maps), but relax the assumption that they are causally connected.  
> Remarkably, we find situations where two operations are neither  
> causally ordered nor in a probabilistic mixture of definite causal  
> orders, i.e. one cannot say that one operations is before or after  
> the other. The correlations between the operations are shown to  
> enable performing a communication task ("causal game") that is  
> impossible if the operations are ordered according to a fixed  
> background time.
>
> For more information about the Q+ hangouts visit http://qplus.burgarth.de/
>
>

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