ICTP is pleased to announce that today, Tuesday 16 May, the ICTP Colloquium, " Decoherence and the Quantum Theory of the Classical", by Prof. Wojciech Zurek, Los Alamos National Laboratory (LANL), New Mexico, USA ,will take place at 16:30 hrs, in the Budinich Lecture Hall, Leonardo Building, ICTP.

BIOSKETCH: Wojciech Hubert Zurek is a leading authority on quantum theory, especially decoherence and non-equilibrium dynamics of symmetry breaking and resulting defect generation (known as the Kibble-Zurek mechanism). He was educated in Kraków, Poland and Austin, Texas (Ph.D. 1979). He spent two years at Caltech as a Tolman Fellow. In 1984 he started at Los Alamos as Oppenheimer Fellow, and was elected Laboratory Fellow in 1996. He was an External Professor at the Santa Fe Institute and co-organized the Quantum Coherence and Decoherence and the Quantum Computing and Chaos programs at UCSB's Institute for Theoretical Physics. In 2005 he received the Alexander von Humboldt Prize, in 2009 Marian Smoluchowski Medal (highest prize of the Polish Physical Society), and in 2010 Albert Einstein Professorship Prize of the Ulm University. Among the books are Quantum theory and Measurement (1983, co-edited with John Wheeler) and Complexity, Entropy, and Physics of Information (1990).

ABSTRACT: Prof. Zurek will describe three insights into the transition from quantum to classical. After a brief discussion of decoherence, he 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 can be then derived 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, and in the right order, these three advances (i)-(iii) elucidate quantum origins of the classical.

The abstract of the talk is available at http://indico.ictp.it/event/8216/

The Colloquium will be livestreamed at http://video.ictp.it/livestream

The poster is attached.

Light refreshments will be served after the lecture.

You are all very warmly invited to attend.

Office of the Director, ICTP