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                 “Decoherence and the Quantum Theory of the Classical”




 Thursday, 27. April 2017

    Video-Recording for any system with MP4-support


       - Video.mp4  (ca.420 Mb)


 15:15 – 16:25



                                                            Wojciech Zurek


Abstract :

I will describe three insights into the transition from quantum to classical.

After a brief discussion of decoherence I will give (i) a minimalist (and decoherence-free)

derivation of preferred states. Such pointer states define events (e.g., measurement outcomes)

without appealing to Born's rule. Probabilities and (ii) Born’s rule then follows from the

symmetries of entangled quantum states. With probabilities at hand one can analyze

information flows from the system to the environment in course of decoherence.

They explain how (iii) robust classical reality arises from the quantum substrate by

accounting for all the symptoms of objective existence of preferred pointer states of

quantum systems through the redundancy of their records in the environment.

Taken together, these three advances (i)-(iii) elucidate quantum origins of the classical.


Suggested reading: W. H. Zurek, Physics Today 10, 44-50 (2014).


The future colloquium program can be found at:




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