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DTSTART:19960101T000000 END:STANDARD BEGIN:STANDARD TZNAME:GMT TZOFFSETFROM:+0100 TZOFFSETTO:+0000 DTSTART:19961027T020000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260621T042644Z DTSTART;VALUE=DATE-TIME:20130522T130000 DTEND;VALUE=DATE-TIME:20130522T140000 SUMMARY:Complexity Forum: Tobias Galla (University of Manchester) TZID:Europe/London UID:20130522-094d43d5385c299a01386c3bd8de7833@warwick.ac.uk CREATED:20120329T091422Z DESCRIPTION:Speaker: Tobias Galla (University of Manchester) Title: Compl exity measures\, information projections and quantum exponential familie s Abstract: I will discuss a set of existing complexity measures for cla ssical multi-particle systems\, based on exponential families and relate d concepts of information geometry. We show that these measures can incr ease under local transformations and when individual degrees of freedom are integrated out. For example a local transformation acting on a singl e particle in an N-particle system may turn 2-particle correlations into 3-particle correlations. This limits the interpretation of such measure s as a quantifier for complexity or correlations. We propose a refined d efinition\, investigate its properties and discuss its numerical evaluat ion. As an example\, we study coupled logistic maps. In the second part of the talk I will discuss similar complexity measures for N-qubit quant um states. Specifically\, we use the distance from the exponential famil y of thermal states of k-particle Hamiltonians as a measure of complexit y (k